9th Grade Algebra Formulas

Pathagorean Theorem

a squared + b squared= c squared

Area of Rectangle

a=wL

Circumference of a circle

c=2 pie r

Difference of Squares

(a squared-b squared)=(a-b)(a+b)

Midpoint Formula

(x2 + x1)/2, (y2 + y1)/2

Slope of 2 Points

(y2-y1)/(x2-x1)

Area of a circle

A=pie r squared

Arithmetic Sequence

An=a1+d(N-1)

Linear Standard Form

Ax+By=C

Volume of Box

v=Lwh

Quadratic Formula

x=(-b+or minus suare root of (bsquared-4ac))/2a

Equation of verticle line

x=h

Exponential Decay

y-a(1-r) to the x power

Exponential Growth

y=a(1+r) to the x power

Quadratic- Vertex Form

y=a(x-h)squared + k

Exponential Function

y=ab squared

Exponential Shift

y=ab to the (x-h) + k

Quadratic-Standard Form and shape of graph

y=ax(squared) + bx +c shape U

Equation of horizontal line

y=k

Slope-Intercept Form

y=mx+b