Question

Factorised x^2-4x-21

Answer 1

Heya❤

$x {}^{2} - 4x - 21 \\ x {}^{2} - 7x + 3x - 21 \\ x(x - 7) + 3(x - 7) \\ (x + 3)(x - 7) \\ \\ now.. \\ x + 3 = 0 \\ x = - 3 \\ \\ and.. \\ x - 7 = 0 \\ x = 7$

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Answer 2

Answer:

=(x-7)(x+3)

Step-by-step explanation:

x²-4x-21

= x²-7x+3x-21

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

=(x-7(x+3)

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