Question

solve inequation x^2-4x-21> or = 0 by algebraic method​

Answer 1

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Answer 2

The correct answer is "x = 7" or "x = -3".

Step-by-step explanation:

$The \ given \ expression \ is:\\\\x^2-4x-21\\\\On \ factorizing \ the \ above \ equation,we \ get\\\\x^2-7x+3x-21=0\\\\x(x-7)+3(x-7)=0\\\\(x-7)(x+3)=0\\\\x-7=0\\\\x=7\\\\Or,\\\\x+3=0\\\\x=-3$

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