Question

#5

Answer 1

The error in solving the equation is x+1=3 , and the correct equation is shown below .

In the question ,

it is given that ,

the equation is given as 2(x + 1)² + 3 = 21

next step , subtracting 3 from both the sides ,

2(x + 1)² = 18

next step , dividing both sides by 2 ,

(x + 1)² = 9

next step is taking square in both the sides ,

x + 1 = ±3    , but in the question it is given as x+1=3 , which is an error ,

hence ,

x + 1 = 3     and     x + 1 = -3

x = 2     and     x = -4

Therefore , The error in solving the equation is x+1=3 , and the correct equation is x + 1 = ±3 .

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