Question

Completely factors 1. x^2-36 2. y^2+4 3. x^2-9y^2

Answer 1

(x + 6)(x - 6) 

y^2 + 2^2

(x + 3y) • (x - 3y)
  

Answer 2

1. x^2-36 = x^2 - 6^2 = (x + 6) (x - 6)
2. y^2+4 = y^2 + 2^2 = (y−2)^2 + 4y
3. x^2 - 9y^2 = x^2 - 3^2y^2  = (x + 3y)(x - 3y)