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How to solve this?? Rational expressions

How to solve this?? Rational expressions-example-1

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Answer: x^2 - 24x + 144

Explanation:

Recall that multiplying the numerator and denominator of a fraction by the same thing does not change the value of the fraction (ex. 3/4 x 1/1 = 3/4).

In this case, you can see that the denominator was mutliplied by (x-12):

(x+12)(x-12) = x^2-144

Therefore, all we need to do is multiply the numberator by (x-12):

(x-12)(x-12) = x^2 - 24x + 144

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