Question

4x^2-36 is divided by x+3

Answer 1

`\frac{4 {x}^(2) - 36 }{x + 3} \\ = \frac{4( {x}^(2) - 9)}{x + 3} \\ = (4(x + 3)(x - 3))/(x + 3) \\ = 4(x - 3) \\ = 4x - 12`

NOTE THE x+3 in the numerator cancels with the x+3 in the denominator.