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Question

Using (x+a)(x+b)=x2+(a+b)x+ab, find 103×104

A
193431
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B
10712
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C
10791
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D
10571
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Solution

The correct option is A 10712
103×104
=(100+3)(100+4)
Using(x+a)(x+b)=x2+(a+b)x+ab
=(100)2+(3+4)100+(3)(4)
=10000+700+12
=10712

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