x^2 + 2x - 15
by Sarah Jarnagin
1. Complete the Square
1.1. x^2+2x-15=0
1.1.1. x^2+2x=15
1.1.1.1. (b/2)^2=(2/2)^2=1
1.1.1.1.1. x^2+2x+1=16
2. Graph
2.1. Locate zeroes
2.1.1. x=3
2.1.2. x=-5
3. Factor the Quadratic
3.1. (x+5)(x-3)=0
3.1.1. x+5=0
3.1.1.1. x=-5
3.1.2. x-3=0
3.1.2.1. x=3
4. Quadratic Formula
4.1. x=(-b+sqrt(b^2-4ac))/2a
4.1.1. x=(-2+sqrt(2^2-4(1)(-15)))/2(1)
4.1.1.1. x=3
4.2. x=(-b-sqrt(b^2-4ac))/2a
4.2.1. x=(-2-sqrt(2^2-4(1)(-15)))/2(1)
4.2.1.1. x=-5