Q. Perform the following operation and express in simplest form.x2−x−72x2−81⋅x+94x+32Answer:
Factor Numerator and Denominator: Factor the numerator and the denominator of the first fraction.The numerator x2−81 is a difference of squares and can be factored as (x+9)(x−9).The denominator x2−x−72 can be factored by finding two numbers that multiply to −72 and add to −1. These numbers are −9 and 8, so the denominator factors as (x−9)(x+8).
Factor Second Fraction: Factor the numerator of the second fraction.The numerator 4x+32 can be factored by taking out the common factor of 4, resulting in 4(x+8).The denominator x+9 remains the same.
Write Factored Expression: Write the expression with the factored terms.The expression now looks like this:((x+9)(x−9))/(x−9)(x+8))×(4(x+8))/(x+9)
Cancel Common Factors: Cancel out the common factors.The (x−9) terms cancel out from the numerator and denominator of the first fraction.The (x+8) terms cancel out from the denominator of the first fraction and the numerator of the second fraction.The (x+9) terms cancel out from the numerator of the first fraction and the denominator of the second fraction.
Multiply After Cancellation: Multiply what's left after cancellation.After cancellation, we are left with:1×4=4
Write Final Expression: Write the final simplified expression.The final simplified expression is just 4, as all the variable terms have been cancelled out.
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