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8. Find the quadratic function f(x) = ax + bx + c that goes through (5,0) and has a local minimum at (0, - 1). f ( X ) = 9. Find the positive values of x and y that minimize S = x + y if xy = 361, and find this minimum value. If x = and y = then S is minimized and equal to (Simplify your answers.) 10. A rectangular page is to contain 40 square inches of print. The dimensions that minimize the amount of paper used The page has to have a 5-inch margin on top and at the are in. bottom and a 2-inch margin on each side (see figure). Find (Simplify your answers. Use a comma to separate the dimensions of the page that minimize the amount of answers.) paper used. 2 k y 1 2 Vi 40 'S 5