# Math Help - another Functions help need please?

1. ## another Functions help need please?

Statement:
determine in 1000 is as P(x,y)=-2x^2-xy-y^2+8x+9y+10
where x is the amount spent on Radio and y is the amount spend on TV respectively. How much money should

Note: not-homework

2. The maximum profit occurs where the gradient equals zero, or in other words, where both the partial derivative wrt x and the partial derivative wrt y are zero at the same time.

Knowing this, can you solve this problem?