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Perform the following operation and express in simplest form.

(x^(2)-16)/(x^(2)-x-12)*(9x+27)/(4x-32)
Answer:

Perform the following operation and express in simplest form.\newlinex216x2x129x+274x32 \frac{x^{2}-16}{x^{2}-x-12} \cdot \frac{9 x+27}{4 x-32} \newlineAnswer:

Full solution

Q. Perform the following operation and express in simplest form.\newlinex216x2x129x+274x32 \frac{x^{2}-16}{x^{2}-x-12} \cdot \frac{9 x+27}{4 x-32} \newlineAnswer:
  1. Factor Polynomials: First, factor each polynomial where possible.\newlineThe numerator x216x^2 - 16 is a difference of squares and can be factored into (x+4)(x4)(x + 4)(x - 4).\newlineThe denominator x2x12x^2 - x - 12 can be factored into (x4)(x+3)(x - 4)(x + 3) by finding two numbers that multiply to 12-12 and add to 1-1.\newlineThe numerator 9x+279x + 27 is a common factor problem and can be factored into 3(3x+9)3(3x + 9), which simplifies further to 3(3)(x+3)3(3)(x + 3) since 99 is also a factor of (x+4)(x4)(x + 4)(x - 4)00.\newlineThe denominator (x+4)(x4)(x + 4)(x - 4)11 is also a common factor problem and can be factored into (x+4)(x4)(x + 4)(x - 4)22.
  2. Rewrite with Factored Terms: Now, rewrite the original expression with the factored terms. (x+4)(x4)(x4)(x+3)×3(3)(x+3)4(x8)\frac{(x + 4)(x - 4)}{(x - 4)(x + 3)} \times \frac{3(3)(x + 3)}{4(x - 8)}
  3. Cancel Common Factors: Next, cancel out the common factors from the numerator and the denominator.\newlineThe (x4)(x - 4) terms cancel each other, and the (x+3)(x + 3) terms cancel each other.\newlineThis leaves us with:\newline(x+4)334(x8)\frac{(x + 4) \cdot 3 \cdot 3}{4 \cdot (x - 8)}
  4. Simplify Expression: Simplify the remaining expression by multiplying the constants together. \newline3×3=93 \times 3 = 9, so the expression becomes: \newline9(x+4)4(x8)\frac{9(x + 4)}{4(x - 8)}
  5. Final Simplified Form: The expression is now simplified as much as possible, and there are no common factors left to cancel.\newlineThe final simplified form is:\newline(9(x+4))/(4(x8))(9(x + 4))/(4(x - 8))

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