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Question
Use the product (a + b) (a – b) = a2 – b2 to evaluate:
9.8 x 10.2
Sum
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Solution
9.8 x 10.2 = (10−0.2) (10+0.2)
= (10)2 − (0.2)2
= 100 − 0.04
= 99.96
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Product of Sum and Difference of Two Terms
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