The function i.e. g(x)=(x+18)(x-3) equivalent to the given equation.
Given that,
Based on the above information, the calculation is as follows:
[tex]g(x) = x^2 + 15x - 54[/tex]
[tex]x^2 + 18x - 3x - 64\\\\x (x + 18) - 3(x + 18)\\\\(x +18 ) (x - 3)[/tex]
Learn more: brainly.com/question/17429689