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Perform the following operation and express in simplest form.

(x^(3)+2x^(2))/(6x)÷(x^(2)+9x+14)/(x^(2)-49)
Answer:

Perform the following operation and express in simplest form.\newlinex3+2x26x÷x2+9x+14x249 \frac{x^{3}+2 x^{2}}{6 x} \div \frac{x^{2}+9 x+14}{x^{2}-49} \newlineAnswer:

Full solution

Q. Perform the following operation and express in simplest form.\newlinex3+2x26x÷x2+9x+14x249 \frac{x^{3}+2 x^{2}}{6 x} \div \frac{x^{2}+9 x+14}{x^{2}-49} \newlineAnswer:
  1. Rewrite as multiplication: First, we need to rewrite the division of the two fractions as a multiplication by the reciprocal of the second fraction.\newline(x3+2x2)/(6x)÷(x2+9x+14)/(x249)=(x3+2x2)/(6x)×(x249)/(x2+9x+14)(x^{3}+2x^{2})/(6x) \div (x^{2}+9x+14)/(x^{2}-49) = (x^{3}+2x^{2})/(6x) \times (x^{2}-49)/(x^{2}+9x+14)
  2. Factor polynomials: Next, we should factor the polynomials in the numerators and denominators where possible.\newlineThe numerator x3+2x2x^{3}+2x^{2} can be factored as x2(x+2)x^2(x+2).\newlineThe denominator 6x6x is already factored.\newlineThe numerator x249x^{2}-49 is a difference of squares and can be factored as (x+7)(x7)(x+7)(x-7).\newlineThe denominator x2+9x+14x^{2}+9x+14 can be factored as (x+7)(x+2)(x+7)(x+2).\newlineSo, the expression becomes:\newlinex2(x+2)6x×(x+7)(x7)(x+7)(x+2)\frac{x^2(x+2)}{6x} \times \frac{(x+7)(x-7)}{(x+7)(x+2)}
  3. Cancel common factors: Now, we can cancel out the common factors in the numerator and the denominator.\newlineThe xx in the denominator of the first fraction cancels with one xx from x2x^2 in the numerator.\newlineThe (x+7)(x+7) and (x+2)(x+2) terms cancel out between the second fraction's numerator and denominator.\newlineThis leaves us with:\newlinex6×(x7)\frac{x}{6} \times (x-7)
  4. Multiply remaining terms: Finally, we multiply the remaining terms.\newlinex6×(x7)=x27x6\frac{x}{6} \times (x-7) = \frac{x^2-7x}{6}\newlineThis is the simplified form of the original expression.

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