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Question

Find the value of a if the expression 3x2+ax7 is divisible by (x - 1)

A
-4
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B
4
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C
10
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D
-10
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Solution

The correct option is A 4
As 3x2+ax7 is divisible by (x1); x=1 will satisfy the equation 3x2+ax7=0
Substituting x=1, we get 3×12+a(1)7=0
=>a=4

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