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Question

Factorize the following polynomials.
(x2x)28(x2x)+12

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Solution

The polynomial is

(x2x)28(x2x)+12

y=(x2x)

Then the polynomial becomes,

y28y+12

=y26y2y+12

=y(y6)2(y6)

=(y2)(y6)

=(x2x2)(x2x6)

Now both factors can be further factorized,

(x22x+x2)(x23x+2x6)

={x(x2)+1(x2)}{x(x3)+2(x3)}

=(x+1)(x2)(x+2)(x3)

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