Question

factorise x3 -23x2+142x-12

Answer 1

Answer:

The correct polynomial is x3 - 23x2 + 142 x - 120

The factors of 120 are

By HIT & TRIAL method,

if x = 1, x3 - 23x2 + 142 x - 120 = 1 - 23 + 142 - 120 = 0

So, ( x - 1) is a factor of x3 - 23x2 + 142 x - 120