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Expansion of (x+a)(x+b)

8.3?7.7 solve...

Question

8.3?7.7 solve using identity

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Solution

Dear Student
(assuming ? = $\times$ )
Using (a+b)(a-b)=a^2-b^2

8.3*7.7=(8+0.3)(8-0.3)=8^2-(0.3)^2=64-0.09=63.91

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