# Question 5: Factorize x 2 − 21 x + 108

Question 5: Factorize x 2 − 21 x + 108

Factorization exercises   — Factorization examples

Solution :

To see as how to evaluate an expression for factorization,  we write it;

Break -21x   into two parts as   -12x   and   -9x    such that ;

and

So,

Taking out x common from first two terms and -9 common from last two terms , we get;

or

Now (x-12) can be taken as common;

i-e;

or

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Insert math as
$${}$$