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Question

Match the polynomials with their respective factors.

A
x1
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B
x7
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C
x5
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D
x3
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Solution

According to the factor theorem, if (xa) is a factor of a polynomial f(x), then f(a) = 0.

For f(x)=x23x+2
f(1)=123× 1+2=0.
Hence, (x1) is the factor of x23x+2.

For f(x)=x27x+12
f(3)=327× 3+12=0.
Hence, (x3) is the factor of x27x+12.

For f(x)=x211x+30
f(5)=5211× 5+30=0.
Hence, (x5) is the factor of x211x+30.

For f(x)=x215x+56
f(7)=7215× 7+56=0.
Hence, (x7) is the factor of x215x+56.

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