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29 votes
29 votes
I was wondering what
(3x + 5)multiplied by
(3x - 5)would be

User Bakari
by
2.6k points

1 Answer

11 votes
11 votes

Given the Multiplication:


(3x+5)(3x-5)

You need to remember the following formula that can be used to multiply binomials in that form:


(a+b)(a-b)=a^2-b^2

In this case:


\begin{gathered} a=3x \\ b=5 \end{gathered}

Therefore, using the formula, you get:


(3x+5)(3x-5)=(3x)^2-(5)^2=9x^2-25

Hence, the answer is:


=9x^2-25

User GodEater
by
3.2k points