Simplify each each expression. Multiply the two polynomials and write your answer in standard form. (5+3a)(5-3a)
First, simplify the expression:
(5+3a)(5-3a)
= 5(5) + 5(-3a) + 3a(5) + 3a(-3a)
= 25 - 15a + 15a - 9a^2
= 25 - 9a^2
Therefore, the answer when the two polynomials are multiplied and written in standard form is 25 - 9a^2.