You can
put this solution on YOUR website!
Instead of doing your problem for you, I'll do one exactly
like it so you can use it as a model to do yours exactly
the same way. I'll do this one instead:
find area if length of a rectangle is (x+3) and its width is 9cm less than its
length
length = (x+3)
width = (x+3)-9 = x+3-9 = x-6
area = length∙width = (x+3)(x-6) = x²-6x+3x-18 = x²-3x-18
Now do yours the exact same way, step by step. Only the numbers
are different.
Edwin