Given the Multiplication:
[tex](3x+5)(3x-5)[/tex]You need to remember the following formula that can be used to multiply binomials in that form:
[tex](a+b)(a-b)=a^2-b^2[/tex]In this case:
[tex]\begin{gathered} a=3x \\ b=5 \end{gathered}[/tex]Therefore, using the formula, you get:
[tex](3x+5)(3x-5)=(3x)^2-(5)^2=9x^2-25[/tex]Hence, the answer is:
[tex]=9x^2-25[/tex]