Question

write the factors of x2-4x-21

Answer 1

Answer:

......

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Answer 2

Step-by-step explanation:

${x}^{2} - 4x - 21 = 0$

${x}^{2} - 7x + 3x - 21 = 0$

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

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

$x = 7 \: \: and \: x = - 3$