Answer
$9x^{2}+18x+5$
Work Step by Step
Step 1: $(3x+1)(3x+5)$
Step 2: We will use the FOIL approach to multiply the two polynomials together.
Step 3: $3x(3x)+3x(5)+1(3x)+1(5)$
Step 4: $9x^{2}+15x+3x+5$
Step 5: $9x^{2}+18x+5$
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