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Question
Use the product (a + b) (a – b) = a2 – b2 to evaluate:
7.7 x 8.3
Sum
Solution
7.7 x 8.3 = (8−0.3) (8+0.3)
= (8)2 − (0.3)2
= 64 − 0.09
= 63.91
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Product of Sum and Difference of Two Terms
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