Question

Factorize: x²

-4x -21​

Answer 1

Answer:

(x-7) (x+3)

Step-by-step explanation:

x^2 -4x -21

using x^2 + (a+b) + ab

where (a+b) = a + b  

ab = a x b

x^2 -7x + 3x -21

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

(x-7) (x+3)

Answer 2

Answer:

x²-4x-21

= x²-7x+3x-21

= X(x-7) +3(x-7)

= (x-7) (X+3)

I hope it will be helpful for you.

Step-by-step explanation:

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