Question

$x { }^{2} - 4x - 21 =$

Answer 1

Heya!!

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I think Uh r asking abt factorization.

= x^2 - 4x - 21

= x^2 - 7x + 3x - 21

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

= (x+3) (x-7)

Hope it helps uh :)

Answer 2

HEY USER ,
HERE IS YOUR ANSWER :-

x^2 - 4x - 21

x^2 - 7x + 3x - 21

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

(x + 3) (x - 7)

x = -3 ; x = 7

HoPE iT HELPS YOU !!!.....✌️✌️