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It's equal to positive b squared, or (b x b) .
Negative sixty-four minus four squared is equal to -80.
(-3)^2 = 9
Because the square root of -25 would be that number that, squared, would equal -25. No number, positive or negative, can result in a negative square. Since -25 is a negative number, no number, positive or negative, can be squared to equal -25.
A negative times a negative is always positive. To see why this is, see the link below.