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Question

How do you evaluate -72?


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Solution

Evaluating the required expression.

As we know, the value of a number raised to the power of 2 is called its square.

If we square a negative number, it becomes positive. Because the product of two negative numbers is always positive.

If we find square of a negative number, -x, here x>0, then,

-x×-x=x2

Here, x2>0.

So,

-72=-7×-7

-72=49

Hence, the value of -72 is 49.


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