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Question

-125×-123 is equal to
(a) -128
(b) -128
(c) 148
(d) -1215

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Solution

(a) (−1/2)8

We have:

left (frac{-1}{2} right )^5timesleft (frac{-1}{2} right )^3=left (frac{-1}{2} right )^{5+3}
=left (frac{-1}{2} right )^8

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