question

Quadratic Formula

answer

x= [-b±√(b²-4ac)] / 2a

question

Difference of Two Squares

answer

a²-b²= (a+b)(a-b)

question

Perfect Square Trinomial

answer

a trinomial in the form a²+2ab+b² : (a +b)² or (a-b)²

question

Permutations (Probabilty)

answer

P(n,r) = n! / (n-r)! (order matters)

question

Combinations (Probabilty)

answer

C(n,r) = n! / (n-r)!r! (order does not matter)

question

Standard Deviation (Probabilty)

answer

δ = √(X₁-x)² +(x₂-x)² +(x₇-x)² / n

question

Pythagorean Theorem

answer

a²+b²=c²

question

Law of Sines

answer

sinA/a=sinB/b=sinC/c

question

Law of Cosines

answer

a²=b²+c²-2bcCosA

question

Arc Length

answer

l = (n/360) x 2Πr

question

Slope

answer

m = y₂-y₁/ x₂-x₁

question

Slope-Intercept Form of a Line

answer

y = mx + b

question

Point-Slope Form of a Line

answer

y - y₁=m (x-x₁)

question

Equation for a circle on a Coordinated Plane

answer

(x-h)² +(y-k)² = r²