d Question 1: Factorize 9 x 2 + 21 x − 8 | Job Exam Rare Mathematics (JEMrare) - Solved MCQs

# Question 1: Factorize 9 x 2 + 21 x − 8

Question 1: Factorize 9 x 2 + 21 x − 8

Factorization exercises — Factorization examples

Solution:

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

9x^2+21x-8

If we multiply first term with third term we get  -72x^2

so,

We break mid term i-e 21x in two parts whose sum is 21x but product is -72x^2

we write it as

$=9x^2+24x-3x-8$

Taking 3x common from first two terms and -1 common from last two terms – we get

$=3x(3x+8)-(3x+8)$

So finally from the whole string we get (3x+8) as common i-e

$=(3x+8){3x-1)$ Copyright secured by Digiprove © 2021

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