Q. Divide. Write your answer in simplest form. r+39r2−1÷2r
Write as fraction: Write the division problem as a fraction.We have the expression (9r2−1)/(r+3)÷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 (9r2−1)/(r+3)×1/(2r).
Factor numerator: Factor the numerator of the first fraction if possible.The numerator 9r2−1 is a difference of squares and can be factored into (3r+1)(3r−1). The factored form of the first fraction is r+3(3r+1)(3r−1).
Multiply by reciprocal: Multiply the first fraction by the reciprocal of the second term.Now we multiply r+3(3r+1)(3r−1) by 2r1. The expression becomes r+3(3r+1)(3r−1)×2r1.
Multiply numerators and denominators: Multiply the numerators and the denominators.When we multiply fractions, we multiply the numerators together and the denominators together. The expression becomes 2r(r+3)(3r+1)(3r−1).
Simplify expression: Simplify the expression if possible.We look for common factors in the numerator and the denominator that can be canceled out. However, there are no common factors between (3r+1)(3r−1) and 2r(r+3), so the expression is already in its simplest form.
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