Question

multiply.
$(3x + 1)(5x + 7)$
simplify your answer.

Explanation:

Step1: Apply FOIL method

$(3x)(5x) + (3x)(7) + (1)(5x) + (1)(7)$

Step2: Calculate each term

$15x^2 + 21x + 5x + 7$

Step3: Combine like terms

$15x^2 + (21x + 5x) + 7$

Answer:

$15x^2 + 26x + 7$