Question

Factories by splitting the middle term:
x^2+21x+108

Answer 1

Here's your answer

x² + 21x + 108 = 0
=> x² + 12x + 9x + 108 = 0
=> x( x + 12)+ 9 ( x + 12) =0
=> ( x + 9) ( x + 12) =0

So,
x = (-9) or ( - 12)