Question

A student says that if 5x2 = 20, then x must be equal to 2. Do you agree or disagree with the student? Justify your answer.

Answer 1

*Just remind you that x is an unknown, not a multiplying symbol.

When x = 2,

       5x2 = 20

    5(2)2 = 20

5 × 2 × 2 = 20

    10 × 2 = 20

         20 = 20

∵L.H.S. = R.H.S.

∴I agree with the student.

Answer 2

Agree that student is correct.

Step-by-step explanation:

Given : A student says that if $5x^2 = 20$, then x must be equal to 2.

To find : Do you agree or disagree with the student? Justify your answer.

Solution :

To know whether the student is correct or not,

We put the value back in the equation if it satisfy then student is correct.

Equation $5x^2 = 20$

Substitute x=2,

$5(2)^2 = 20$

$5\times 4 = 20$

$20 = 20$

It is true.

So, Agree that student is correct.

#Learn more

A student says that if 5x2 = 20, then x must be equal to 2. Do you agree or disagree with the student? Justify your answer.

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