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