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Question

Question 6(ix)
Using identities, evaluate:
1.05×9.5

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Solution

1.05×9.5=1.05×0.95×10
=(1+0.05)(10.05)×10
=[(1)2(0.05)2]×10
=[10.0025]×10
[Using identity (ab)(a+b)=a2b2]
=0.9975×10
=9.975

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