Answer:
[tex]9x^2-42x+49[/tex]Explanation:
Here, we want to square the binomial
We proceed as follows:
[tex]\begin{gathered} (3x-7)^2\text{ = (3x-7)(3x-7)} \\ \end{gathered}[/tex]We can further breakdown this as follows:
[tex]\begin{gathered} 3x(3x-7)-7(3x-7) \\ =9x^2-21x-21x+49 \\ =9x^2-42x+49 \end{gathered}[/tex]