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Question

If f(x)=7x215, then find the value of f(3) f(5).

A
102
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B
66
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C
112
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D
54
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Solution

The correct option is C 112
Given f(x)=x215
Then f(3)=7(3)215=7×915=6315=48
And f(5)=7(5)215=7×2515=17515=160
So, f(3)f(5)=48160=112

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