Algebra 1 Formulas

x= [-b±√(b²-4ac)] / 2a

a²-b²= (a+b)(a-b)

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

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

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

δ = √(X₁-x)² +(x₂-x)² +(x₇-x)² / n

a²+b²=c²

sinA/a=sinB/b=sinC/c

a²=b²+c²-2bcCosA

l = (n/360) x 2Πr

m = y₂-y₁/ x₂-x₁

y = mx + b

y - y₁=m (x-x₁)

(x-h)² +(y-k)² = r²