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Question

Using (x+a)(x+b)=x2+(a+b)x+ab, find
9.7×9.8

A
90.06
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B
99.46
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C
95.06
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D
98.56
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Solution

The correct option is C 95.06
9.7×9.8
=(9+0.7)(9+0.8)
Using,
(x+a)(x+b)=x2+(a+b)x+ab we get,
92+(0.7+0.8)9+0.7×0.8
=81+13.5+0.56
=95.06

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