Question

Factorise : x² + 4x – 21​

Answer 1

Answer:

x2+7x-3x-21=0

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

x=3 Or x=-7

Answer 2

Answer:

(x-4) (x+7)

Step-by-step explanation:

${x}^{2} + 4x - 21 \\ or \: {x}^{2} + 7x - 4x - 21 \\ or \: \: x(x + 7) - 4(x + 7) \\ or \: (x - 4)(x + 7)$

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