Question

How do you factor `4x ^ { 2} - 2x - 20`?

Answer 1

We need to play with factors of `4` (1 x 4, 2 x 2) and factors of `20` (1 x 20, 2 x 10, 4 x 5) which will allow us to factor this quadratic:

`4x^2 - 2x - 20 = (2x + 4)(2x - 5)`