Question

Which of the following is an algebraic expression for “ 1 is added to twice a number”
a) x + 1 b) x – 1 c) 2x + 1 d) 3x + 1

Answer 1

Answer:

Let the number be x

Given: 

x is added to twice its x2 which gives 21.

2x2+x=21

⟹2x2+x−21=0

⟹2x2+7x−6x−21=0

⟹x(2x+7)−3(2x+7)=0

⟹(x−3)(2x+7)=0

⟹x=3,−27

The number is 3,−27

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Step-by-step explanation:

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