Everything is correct except for -x^2 when you take it out of brackets. If you square a negative it becomes a positive so the correct answer should be:
P(-x)=(-x)^3 + (-x)^2 + (-x) + 1
=-x^3 + x^2 - x + 2
A gardener is designing a new garden in the shape of a trapezoid.
She wants the shorter base to be twice the height and the longer base to be 4 feet longer than the shorter base.
If she has enough topsoil to create a 60ft^2 garden, what dimensions should she use for the garden?