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Question

The expression 4x2+16x+m is divisible by (x + 3). Then, m is a divisor of _____________.

A
4
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B
16
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C
20
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D
12
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Solution

The correct options are
A 4
D 12
Let f(x)=4x2+16x+m
(x+3) is a factor of f(x)
f(3)=0
4(3)2+16(3)+m=0
3648+m=0
m=12
m is a divisor of both 4 and 12.
Option A and D are correct.

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