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Perform the following operation and express in simplest form.

(x^(2)+9x)/(x-9)÷(x^(2)-81)/(x^(2)-7x-18)
Answer:

Perform the following operation and express in simplest form.\newlinex2+9xx9÷x281x27x18 \frac{x^{2}+9 x}{x-9} \div \frac{x^{2}-81}{x^{2}-7 x-18} \newlineAnswer:

Full solution

Q. Perform the following operation and express in simplest form.\newlinex2+9xx9÷x281x27x18 \frac{x^{2}+9 x}{x-9} \div \frac{x^{2}-81}{x^{2}-7 x-18} \newlineAnswer:
  1. Identify and Rewrite Division: Identify the given expression and rewrite the division as multiplication by the reciprocal.\newlineThe expression is (x2+9x)/(x9)÷(x281)/(x27x18)(x^{2}+9x)/(x-9) \div (x^{2}-81)/(x^{2}-7x-18), which can be rewritten as (x2+9x)/(x9)×(x27x18)/(x281)(x^{2}+9x)/(x-9) \times (x^{2}-7x-18)/(x^{2}-81).
  2. Factor Numerator and Denominator: Factor the numerator and denominator of both fractions where possible.\newlineThe numerator x2+9xx^{2}+9x can be factored as x(x+9)x(x+9).\newlineThe denominator x281x^{2}-81 can be factored as (x+9)(x9)(x+9)(x-9) because it is a difference of squares.\newlineThe denominator x27x18x^{2}-7x-18 can be factored as (x9)(x+2)(x-9)(x+2) because it is a quadratic expression.
  3. Rewrite with Factored Terms: Rewrite the expression with the factored terms.\newlineThe expression becomes (x(x+9))/(x9)×((x9)(x+2))/(x+9)(x9)(x(x+9))/(x-9) \times ((x-9)(x+2))/(x+9)(x-9).
  4. Cancel Common Factors: Cancel out common factors from the numerator and denominator.\newlineThe factors (x+9)(x+9) and (x9)(x-9) cancel out from the numerator and denominator.\newlineThe expression simplifies to x×(x+2)x \times (x+2).
  5. Multiply Remaining Factors: Multiply the remaining factors.\newlineMultiplying xx by (x+2)(x+2) gives x2+2xx^2 + 2x.
  6. Check for Further Simplification: Check for any further simplification. The expression x2+2xx^2 + 2x cannot be factored further, so this is the simplest form.

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