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Evaluate the Expression when x is -9

When is -9, x^2 is [ ]
(Simplify your answer)

1 Answer

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Explanation:

that only means we need to put the given values into every place, where the variable is used in the expression.

this is straight forward.

x² for x = -9 means

(-9)² = 81

you remember, a² = a×a.

and when a is negative, this is then the multiplication of a negative number with a negative number, and that result is positive.

so, a square operation always delivers a positive result for real numbers as input, no matter if the input was already positive or negative.

User Charlot
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