14 terms

Algebra 1 Formulas

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Quadratic Formula
x= [-b±√(b²-4ac)] / 2a
Difference of Two Squares
a²-b²= (a+b)(a-b)
Perfect Square Trinomial
a trinomial in the form a²+2ab+b² : (a +b)² or (a-b)²
Permutations (Probabilty)
P(n,r) = n! / (n-r)! (order matters)
Combinations (Probabilty)
C(n,r) = n! / (n-r)!r! (order does not matter)
Standard Deviation (Probabilty)
δ = √(X₁-x)² +(x₂-x)² +(x₇-x)² / n
Pythagorean Theorem
a²+b²=c²
Law of Sines
sinA/a=sinB/b=sinC/c
Law of Cosines
a²=b²+c²-2bcCosA
Arc Length
l = (n/360) x 2Πr
Slope
m = y₂-y₁/ x₂-x₁
Slope-Intercept Form of a Line
y = mx + b
Point-Slope Form of a Line
y - y₁=m (x-x₁)
Equation for a circle on a Coordinated Plane
(x-h)² +(y-k)² = r²