Question

Factorise 2x^2-x-21 by middle term splitting and also by factor theorem.
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Answer 1

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Answer 2

Answer:

(x+3)(2x-7)

Step-by-step explanation:

ANSWER

The given expression 2x  

2

−x−21 can be factorised as follows:

2x  

2

−x−21=2x  

2

−7x+6x−21=x(2x−7)+3(2x−7)=(x+3)(2x−7)

Hence, 2x  

2

−x−21=(x+3)(2x−7)