Question

x square - 4 x minus 21 is equal to zero factorise​

Answer 1

x^2 - 4x - 21 = 0

x^2 + 3x - 7x -21 = 0

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

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

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Answer 2

Step-by-step explanation:

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