19 SAT Math Formulas you need to know

Complex Conjugate

(a+bi) (a- bi)= a²+b².

Slope-Intercept Formula

y=mx+b

Vertex Form of a Parabola/Quadratic

y=a(x-h)² +k

Distance Formula

d = √((x₂-x₁)² + (y₂-y₁)²)

Quadratic Formula

x = (-b±√(b² -4ac))/2a

Exponent Rule(Multiplication)

a^n * a^m = a^(n+m)

Exponent Rule(Division)

a^m/a^n = a^(m-n)

Exponent Rule(Power raised to a Power)

(a^n)^m = a^(n*m)

Difference of Squares

(x-y)(x+y) = x²-y²

Complex Conjugate

(a+bi)(a-bi)=a²+b²

Exponential Growth and Decay

y=a(1±r)^x

Simple interest

A=Prt

Compound interest

A=P(1+(r/n))^nt

Area of a Equilateral Triangle(knowing a side)

A=(√(3) ∙ s²)/4

Equation of a Circle

(x-h)² + (y-k)² = r

Degrees to Radians

degrees * (π/180)

Pythagorean Theorem

a^2 + b^2 = c^2

Regular Polygon Interior Angle

180(n-2)/n

Length of Arc in a Circle

(central angle/360)2πr

Area of Sector in a Circle

(central angle/360)πr²