5 Flashcards
exponential func def
has the form Ab^x, where A and b are real numbers
A cannot = 0
b >1
-f(x)
reflection about the x axis
f(-x)
reflection about the y axis
type 1: solving for missing exponent
equation can be re-written using the same bases
ex: 25^x = 125
(5^2)^x = 5^3
2x = 3
x = 3/2
exponent same base theorem
if b^x = b^y then x=y
property of exponents: m<n
iff b^m < b^n (b>1)
property of exponents: m<n (2)
iff b^m > b^n (0<b<1)
compound interest formula
A(t) = P(1+r/m)^mt
p - principal value
r - interest rate
m - times compounded
t - years
continuous compounding formula
A = Pe^rt
P amount invested that pays annual interest compounded continuously for t years
logarithm def
for all positive numbers a, that dont = 1
loga^x = the exponent to which the base, a, must be raised to to obtain x
logb^x=y is equal to x = b^y
*an exponent
common logarithm
log(x) = log10^x
natural log
ln(x) = loge^x
log property: product rule
loga^xy = loga^x + loga^y
log property: quotient rule
loga^x/y = loga^x - loga^y
log property: power rule
loga^x^p = ploga^x