His answer is incorrect
The correct answer is:
[tex]4x^2-12x+9[/tex]This is the square of (2x - 3)
Explanation:Given (2x - 3)
The square of this is:
[tex]\begin{gathered} (2x-3)^2 \\ =4x^2-12x+9 \end{gathered}[/tex]His answer of 4x² - 9 is incorrect.