Question

solve this equation ( x.x+10x+21 )

Answer 1

x² + 10x + 21

x² + (7 + 3)x + 21

x² + 7x + 3x + 21

x(x + 7) + 3(x + 7)

(x + 7)(x + 3)




I hope this will help you


(-:

Answer 2

Heya !!

Here is your answer.

Given :
x.x+10x+21
= x² + 10x + 21

Here, we have to find reply numbers a and b such that a+b = 10 and a×b = 21.

By looking at the prime factors of 21..
21 = 3×7
We get a = 3 and b = 7.

So,
x² + 10x + 21
= x² + 7x + 3x + 21
= x ( x + 7) + 3 ( x +7)
= (x + 7)(x + 3)


Hope you got it