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Divide. Write your answer in simplest form. \newline9r21r+3÷2r\frac{9r^2 - 1}{r + 3} \div 2r

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Q. Divide. Write your answer in simplest form. \newline9r21r+3÷2r\frac{9r^2 - 1}{r + 3} \div 2r
  1. Write as fraction: Write the division problem as a fraction.\newlineWe have the expression (9r21)/(r+3)÷2r(9r^2 - 1)/(r + 3) \div 2r. To simplify the division, we can rewrite it as a multiplication by the reciprocal of the second term. So, we rewrite the division as (9r21)/(r+3)×1/(2r)(9r^2 - 1)/(r + 3) \times 1/(2r).
  2. Factor numerator: Factor the numerator of the first fraction if possible.\newlineThe numerator 9r219r^2 - 1 is a difference of squares and can be factored into (3r+1)(3r1)(3r + 1)(3r - 1). The factored form of the first fraction is (3r+1)(3r1)r+3\frac{(3r + 1)(3r - 1)}{r + 3}.
  3. Multiply by reciprocal: Multiply the first fraction by the reciprocal of the second term.\newlineNow we multiply (3r+1)(3r1)r+3\frac{(3r + 1)(3r - 1)}{r + 3} by 12r\frac{1}{2r}. The expression becomes (3r+1)(3r1)r+3×12r\frac{(3r + 1)(3r - 1)}{r + 3} \times \frac{1}{2r}.
  4. Multiply numerators and denominators: Multiply the numerators and the denominators.\newlineWhen we multiply fractions, we multiply the numerators together and the denominators together. The expression becomes (3r+1)(3r1)2r(r+3)\frac{(3r + 1)(3r - 1)}{2r(r + 3)}.
  5. Simplify expression: Simplify the expression if possible.\newlineWe look for common factors in the numerator and the denominator that can be canceled out. However, there are no common factors between (3r+1)(3r1)(3r + 1)(3r - 1) and 2r(r+3)2r(r + 3), so the expression is already in its simplest form.

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