Math, asked by Bantishaikh2596, 9 months ago

Factorise the expression x^2-4x-21

Answers

Answered by krish36978

1

x^2 - 4x - 21 = 0

x^2 -7x + 3x -21 =0

x(x-7) + 3 ( x - 7 )=0

(x+3) ( x - 7 ) = 0

x= -3 & x = 7

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