BTGmoderatorDC wrote:Which of the following must be non-negative?
A. (a-0.9)(a-1)
B. (a+1)(a-1)
C. (a+0.9)(a+1)
D. (a-0.9)(a-0.9)
E. a(a+1)
D: (a-0.9)(a-0.9) = (a-0.9)².
The square of a value cannot be negative.
The correct answer is
D.
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