Question

factorise : 2x^2-x-21​

Answer 1

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)

Answer 2

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