PSAT math formulas

Slope-intercept form

y=mx+b

slope

y2-y1/x2-x1 and rise/run

point slope

y-y1=m(x-x1)

vertex form

f(x) = a(x-h)^2 + k

vertex

(h,k)

distance formula

Quadratic formula

exponent rule (multiplication)

a^n a^m = a^n+m

add exponents

exponent rule (division)

a^n /a^m= a^n-m

subtract exponents

exponent rule (power)

multiply exponents

midpoint formula

speed

distance/time

distance

(speed)(time)

exponential growth

a(1+r)²

exponential decay

a(1-r)²

mean

sum of terms/ number of terms

median

mode

most frequent

range

greatest - least

probability

number of desired outcomes/ total number of possible outcomes

SOH CAH TOA