Question

What is -60a^2+642a-420

Answer 1

The answer is −6(10a−7)(a−10)

Explanation:

1) Factor out the common term 6.

`- 6( {10a}^(2) - 107a + 70)`

2) Split the second term in 10a² - 107a + 70 into two terms.

`- 6( {10a}^(2) - 7a - 100a + 70)`

3) Factor out common terms in the first two terms, then in the last two terms.

`- 6(a(10a - 7) - 10(10a - 7))`

4) Factor out the common term 10a - 7.

`- 6( 10a - 7)(a - 10`

Therefor, the answer is -6 ( 10a - 7) (a - 10).