Question

solve the following. Single choice.
(12³+6²+6)÷6
options :
1. 2²++1
2. 2³+2+1
3. 12²+x+1
4. 2x²+x
​

Answer 1

Answer:

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)