How do you solve 2x ^ { 2} - 6x - 36= 0?

1 Answer
Nov 29, 2016

x=-3 or x=6

Explanation:

2x^2-6x-36=0

Factorise.

2x^2-12x+6x-36=0

2x(x-6)+6(x-6)=0

(2x+6)(x-6)=0

2x+6=0 or x-6=0

2x=-6 or x=6

Divide both sides of the first equation by 2.

x=-3 or x=6