ACT Math Formulas(Math formulas for problems found on the SAT and ACT. While the SAT lists many of the formulas at the beginning of each math test, the ACT does not. And, you will save time if you memorize these.)

ACT Math Formulas
Quadratic Formula - Answer -b±[√b²-4ac]/2a

Slope - Answer (y₂-y₁)/(x₂-x₁)

Slope-Intercept - Answer y=mx+b

a³-b³ - Answer (a-b)(a²+ab+b²)

a³+b³ - Answer (a+b)(a²-ab+b²)

a²-b² - Answer (a-b)(a+b)

a²-2ab+b² - Answer (a-b)²

a²+2ab+b² - Answer (a+b)²

(a+b)(c+d) - Answer ac+ad+bc+bd

a(b+c) - Answer ab+ac

sine ratio - Answer opposite ÷ hypotenuse

cosine ratio - Answer adjacent ÷ hypotenuse

tangent ratio - Answer opposite ÷ adjacent

A function is ___________ a relation - Answer always

Direct Variation - Answer y=kx

Inverse Variation - Answer y=k/x

Slope intercept form - Answer y=mx+b

Point-Slope form - Answer y-y₁=m(x-x₁)

Standard form - Answer Ax + By=C, where A, B, and C are not decimals or fractions,
where A and B are not both zero, and where A is not a negative

Undefined - Answer When there is a vertical line that has different y points, but the
same x point