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x^2 + 4x – 21=?  A. (x - 7) (x + 3)  B. (x + 7) (x - 3)  C. (x - 7) (x - 3)  D. (x + 7) (x + 3)

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x2 + 4x – 21=? 

A. (x - 7) (x + 3) 

B. (x + 7) (x - 3) 

C. (x - 7) (x - 3) 

D. (x + 7) (x + 3)

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1 Answer

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Best answer

x2 + 4x – 21 

Factorizing the equation and taking x and – 3 as common, 

= x2 + 7x – 3x – 21 

= x(x + 7) – 3(x + 7) 

= (x – 3)(x + 7).

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