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Question

Find the value of a & b, if 8x4+14x32x2+ax+b is divisible by 4x2+3x2

A
(7,7)
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B
(7,2)
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C
(7,2)
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D
None of these
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Solution

The correct option is B (7,2)
8x4+14x32x2+ax+b is divisible by 4x2+3x2
remainder =0
(4x2+3x2))¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯8x4+14x32x2ax+b8x4+6x34x2___________________8x3+2x2ax+b8x3+6x24x___________________4x2+(a+4)x+b4x23x+2___________________0+(a+4+3)x+(b2)
(a+7)x+(b2)=0
a+7=0 and b2=0
a=7 and b=2
(a,b)=(-7,2)$

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