Question

factorise - x square + 4x - 21​

Answer 1

Step-by-step explanation:

see the image for the answer

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 + 3)(x - 7) = 0

first case:

x + 3 = 0

x = -3

second case:

x - 7 = 0

x = 7

x = -3 (or) x = 7

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