5

^{2}- 2

^{2}= (5 - 2)

^{2}= 3

^{2}= 9

This is very interesting.

It seems to be correct. That is the problem with this form of mathematical operation.

If you are aware that A

^{2}- B

^{2}= (A + B)(A - B), then this mistake will not occur.

It is this slip-of-the-mind type of human error.

It occurs when you are not alert or too tired after too many assignment quesions.

The

**correct answer**is 5

^{2}- 2

^{2}= 25 - 4 = 21.

Or (5 + 2)(5 - 2) = 7 x 3 = 21.

Simple?

This is why maths is interesting. It catches you when you are not alert!

.

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