Bytelearn - cat image with glassesAI tutor

Welcome to Bytelearn!

Let’s check out your problem:

Perform the following operation and express in simplest form.

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

Perform the following operation and express in simplest form.\newlinex281x2+7x18÷x99x2 \frac{x^{2}-81}{x^{2}+7 x-18} \div \frac{x-9}{9 x^{2}} \newlineAnswer:

Full solution

Q. Perform the following operation and express in simplest form.\newlinex281x2+7x18÷x99x2 \frac{x^{2}-81}{x^{2}+7 x-18} \div \frac{x-9}{9 x^{2}} \newlineAnswer:
  1. Identify Operation and Rewrite: Identify the operation to be performed and rewrite the division as multiplication by the reciprocal.\newlineThe given expression is a division of two fractions, which can be rewritten as the multiplication of the first fraction by the reciprocal of the second fraction.\newline(x281)/(x2+7x18)×(9x2)/(x9)(x^{2}-81)/(x^{2}+7x-18) \times (9x^{2})/(x-9)
  2. Factor Numerator and Denominator: Factor the numerator and denominator of the first fraction where possible.\newlineThe numerator x281x^2 - 81 is a difference of squares and can be factored as (x+9)(x9)(x + 9)(x - 9).\newlineThe denominator x2+7x18x^2 + 7x - 18 can be factored by finding two numbers that multiply to 18-18 and add to 77, which are 99 and 2-2.\newlineSo, x2+7x18x^2 + 7x - 18 factors as (x+9)(x2)(x + 9)(x - 2).\newlineNow the expression is (x+9)(x9)(x+9)(x2)×9x2x9\frac{(x + 9)(x - 9)}{(x + 9)(x - 2)} \times \frac{9x^{2}}{x-9}.
  3. Cancel Common Factors: Cancel out common factors in the first fraction.\newlineThe (x+9)(x + 9) terms cancel out in the numerator and denominator of the first fraction.\newlineNow the expression is x9x2×9x2x9\frac{x - 9}{x - 2} \times \frac{9x^{2}}{x-9}.
  4. Multiply Remaining Terms: Cancel out the common (x9)(x - 9) terms in the resulting expression.\newlineThe (x9)(x - 9) terms cancel out in the numerator of the first fraction and the denominator of the second fraction.\newlineNow the expression is 1(x2)×9x21\frac{1}{(x - 2)} \times \frac{9x^{2}}{1}.
  5. Check for Simplification: Multiply the remaining terms.\newlineMultiplying the remaining terms gives us 9x2x2\frac{9x^2}{x - 2}.
  6. Check for Simplification: Multiply the remaining terms.\newlineMultiplying the remaining terms gives us 9x2x2\frac{9x^2}{x - 2}.Check for any further simplification.\newlineThe expression 9x2x2\frac{9x^2}{x - 2} cannot be simplified further as there are no common factors to cancel out.

More problems from Operations with rational exponents