Question

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

Answer 1

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`