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Perform the following operation and express in simplest form.

(x^(2)-81)/(x^(2)-x-72)*(4x+32)/(x+9)
Answer:

Perform the following operation and express in simplest form.\newlinex281x2x724x+32x+9 \frac{x^{2}-81}{x^{2}-x-72} \cdot \frac{4 x+32}{x+9} \newlineAnswer:

Full solution

Q. Perform the following operation and express in simplest form.\newlinex281x2x724x+32x+9 \frac{x^{2}-81}{x^{2}-x-72} \cdot \frac{4 x+32}{x+9} \newlineAnswer:
  1. Factor Numerator and Denominator: Factor the numerator and the denominator of the first fraction.\newlineThe numerator x281x^2 - 81 is a difference of squares and can be factored as (x+9)(x9)(x + 9)(x - 9).\newlineThe denominator x2x72x^2 - x - 72 can be factored by finding two numbers that multiply to 72-72 and add to 1-1. These numbers are 9-9 and 88, so the denominator factors as (x9)(x+8)(x - 9)(x + 8).
  2. Factor Second Fraction: Factor the numerator of the second fraction.\newlineThe numerator 4x+324x + 32 can be factored by taking out the common factor of 44, resulting in 4(x+8)4(x + 8).\newlineThe denominator x+9x + 9 remains the same.
  3. Write Factored Expression: Write the expression with the factored terms.\newlineThe expression now looks like this:\newline((x+9)(x9))/(x9)(x+8))×(4(x+8))/(x+9)((x + 9)(x - 9))/(x - 9)(x + 8)) \times (4(x + 8))/(x + 9)
  4. Cancel Common Factors: Cancel out the common factors.\newlineThe (x9)(x - 9) terms cancel out from the numerator and denominator of the first fraction.\newlineThe (x+8)(x + 8) terms cancel out from the denominator of the first fraction and the numerator of the second fraction.\newlineThe (x+9)(x + 9) terms cancel out from the numerator of the first fraction and the denominator of the second fraction.
  5. Multiply After Cancellation: Multiply what's left after cancellation.\newlineAfter cancellation, we are left with:\newline1×4=41 \times 4 = 4
  6. Write Final Expression: Write the final simplified expression.\newlineThe final simplified expression is just 44, as all the variable terms have been cancelled out.

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