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Question

Express the following rational expressions in its lowest term.
(x−3)(x2−5x+4)(x−4)(x2−2x−3)

A
x+1x1
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B
x1x+1
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C
1
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D
None of the above
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Solution

The correct option is B x1x+1
p(x)=(x3)(x25x+4)
= (x3)(x1)(x4)
q(x)=(x4)(x22x3)
= (x4)(x3)(x+1)

Since H.C.F of [p(x),q(x)] is not 1, this is not the lowest terms.
Now p(x)q(x)=(x3)(x1)(x4)(x4)(x3)(x+1)

= x1x+1

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