A student solved the given quadratic equation in the following way : x 2 + 6x = 27 x 2 + 6x + 9 = 27 + 9 (x + 3) 2 = 36 x + 3 = 6 x = 6 - 3 x = 3 Which of the following represents the error committed by the student ?

Correct Answer is : Not including the negative root in the solution

Using the wrong algebraic identity

Not including the negative root in the solution

There is no mistake as both the roots are equal

CTET 2 Math and Science 11 Jan 2023 Paper

Question : 53 of 150

Marks: +1, -0

A student solved the given quadratic equation in the following way :
x² + 6x = 27
x² + 6x + 9 = 27 + 9
(x + 3)² = 36
x + 3 = 6
x = 6 - 3
x = 3
Which of the following represents the error committed by the student ?

Adding 9 on both the sides
Using the wrong algebraic identity
Not including the negative root in the solution
There is no mistake as both the roots are equal

Validate

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