Question

A rectangular garden has a walk around it of width x. The garden is 20 ft by 15 ft. Write a function representing the combined area, A(x), of the garden and walk. Write as a polynomial is standard form.

Answer 1

Draw a diagram. That simple step will make solution a lot easier.

A(x) = (20+2x)(15+2x)
Now you can expand that to standard form.