Math, asked by kanchanbajaj74, 1 day ago

Factorise x ² + 4 × (- 21)

Answers

Answered by tanvimehra1002

1

Answer:

x2-4x-21=(x-7)(x+3)

Step-by-step explanation:

We split -4 into two whose sum is -4 and product -21. ∴x2-4x-21=x2-7x+3x-21. =(x-7)(x+3). Hence, x2-4x-21=(x-7)(x+3)

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