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Math > Algebra I > Flashcards

Algebra I Flashcards

1
Q

GEDMAS

A

Order of operations

Grouping, exponents, division/multiplication, addition/subtraction

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2
Q

Real numbers

A

Represent real values. Can be rational or irrational or negative. Whatever

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3
Q

Natural Numbers vs. Whole Numbers

A

Natural numbers are integers that start with 1

Whole numbers are integers that starte with 0

Integers can be negative

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4
Q

Rational Numbers

A

Can be any number that can be represented by a fraction made up of two integers (can have results that are forever repeating, as long as there is a pattern)

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5
Q

Irrational Numbers

A

Numbers that cannot be expressed as a fraction of two integers. Go on forever and don’t have any repeated patterns

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6
Q

Prime vs. Composite

A

Prime numbers are numbers that can only be evenly divided by itself and 1. The first prime number is 2, and it is the only even one. Composite numbers are any number that isn’t prime

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7
Q

Factorial definition

A

n! = n*(n-1)*(n-2)*(n-3)…3*2*1

And 0! = 1

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8
Q

Communitive property

A

Order doesn’t matter

a+b=b+a

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9
Q

Associative Property

A

Grouping doesn’t matter:

(a+b)+c = a+(b+c)

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10
Q

Distributive Property

A

a (b + c) = ab + ac

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11
Q

Structure of a fraction

A

Numerator / Denominator

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12
Q

What is an improper fraction

A

The numerator is greater than the denominator

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13
Q

What is a mixed number

A

Integer plus a fraction

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14
Q

What is a least common multiple

A

The smallest number that two numbers can evenly go into

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15
Q

Sum of a finite arithmetic series

A

where a1 is the first term, an is the last term

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16
Q

Sum of an infinite geometric sequence

A

a is the first term, r is the ratio (0 to 1)

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17
Q

Sum of a finite geometric sequence

A

a is the first term, r is the ratio 0 to 1

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18
Q

The 5 rules of exponents

A

Keep in mind the bottom two apply to radicals

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19
Q

Rules for radical expressions (same as the rules of exponents, but a good visual)

A
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20
Q

Fractional radical notation

A
21
Q

What is prime factorization?

A

prime factorization of a number is the unique product of prime numbers that results in the given number

22
Q

How do you determine what the smallest number is that a group of numbers can evenly go into?

A

Do prime factorization on all the numbers, and multiply the prime numbers by each other for a final product (the catch is, don’t repeat values if the prime factor is already listed)

23
Q

How to simplify fractions to solve an equation

A

The key here is to multiply both sides of the equation by the least common denominator, not just one side!

24
Q

Rules of Divisibility (2-6)

A

2: number is even
3: sum of digits is a number divisibile by 3
4: last two digits form a number divisible by 4
5: 5 or 0 last digit
6: the number is divisible by 2 and 3

25
Q

Rules of Divisibility (7-12)

A

7: take the last digit, double it, and subtract it from the rest of the number. If you get an answerdivisible by 7 (including zero), then the original number is divisible by seven. If you don’t know the new number’s divisibility, you can apply the rule again.
8: Last three digits form a number divisible by 8
9: the sum of the digits is a number divisible by 9
11: The difference between the sums of the alternating digits is divisible by 11
12: the number is divisible by 3 and 4

26
Q

What is a GCF

A

Greatest common factor is the largest possible number that evenly divides each term of an expression containing two or more terms (or evenly divides the numerator and denominator of a fraction)

The largest number that divides evenly into all the numbers. GCF of 15 and 25 is 5.

The expression becomes “prime” when it cannot be factored anymore

27
Q

What is a binomial?

A

An algebraic expression with 2 terms in it.

Polynomial is the general term

28
Q

GCF / Difference of Squares / Sum or Difference of Cubes

(Factoring Binomials)

A
29
Q

GCF / Un-Foil / Factoring by Grouping

(Factoring Trinomials)

A
30
Q

Perfect square trinomial quickie

A
31
Q

Is (a2+b2) == (a+b)2

A

NO

32
Q

Qaudratic Formula

A
33
Q

What is the remainder theorem

A

When you divide a polynomial by some linear binomial, the remainder resulting from the division is the same number as you’d get if you evaluated the polynomial using the opposite of the constant in the binomial

The best way to accomplish this is synthetic division

(if you use 2 in syn div, then the linear binomial is (x-2))

34
Q

What is the rational roots theorem

A

The rational roots theorem is a very useful theorem. It tells you that given a polynomial function with integer or whole number coefficients, a list of possible solutions can be found by listing the factors of the constant, or last term, over the factors of the coefficient of the leading term. These potential solutions can be quickly tested with synthetic division to verify.

35
Q

How to accomplish synthetic division

A

Be sure to put zeros for any coefficients that are not present. You are adding…

36
Q

What does cubic and quadratic equation mean

A

Power of three and power of two

A cubic equation can have up to 3 solutions

37
Q

Interval notation for inequalities

A

(x,y) is noninclusive of x and y

[x,y] is inclusive of x and y

if infinity, use a “)”, not a ]

38
Q

How inequalities are affected by operators

A

Adding subtracting stays the same

If you divide or multiply by a negative number, the sign flips

And don’t multiply or divide by 0

39
Q

How to solve absolute value equations

A

Write as two seperate problems, where the absolute value stuff either equals positive or negative

40
Q

Formula for simple interest

A

I = Prt

Where I equals interest, P is start amount, r is interest rate, t is time

41
Q

Formula for compound interest

A

n is the number of times it’s compounded each time unit, t

42
Q

Difference between combinations and permutations

A

In permutations, order matters

43
Q

Equation for Combination

A

n is how many items are available

r is how many are to be chosen per iteration

Think “niccer”, n always greater than or equal to r

Has the extra r in the denominator to make smaller (because smaller than a permutation)

44
Q

Equation for Permutation

A

Where n is total number of items and r is the number per iteration

Think “nipper”, n always greater than or equal r

45
Q

Linear system of equations by substitution

A

Can be solved into either equation

46
Q

Slope intercept form and point-slope form equations for a line

A

y = mx + b

y - y1 = m( x - x1 )

47
Q

Midpoint Formula

A
48
Q

Standard form for a line

A

Ax + By = C

Math (8 decks)

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