Algebra-1

Question Analysis
This question tests the student's ability to multiply polynomials and combine like terms, which is a fundamental skill in Algebra-1.

Key Concept Explanation
To multiply polynomials, each term in the first polynomial must be multiplied by each term in the second polynomial. After multiplying, combine like terms to simplify the expression.

Step-by-step Solution
1. Distribute 3r (from the binomial) to each term in the trinomial:

2. Distribute 5 (from the binomial) to each term in the trinomial:

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