2015 · Q90
The difference of maximum values of the expressions (6+5x-x²) and (y-6-y²) for any real values of x and
Elementary MathematicsTrigonometry
- A16
- B17
- C18
- D19
Explanation
Max of 6 + 5x - x^2 is 12.25 (at x = 2.5); max of y - 6 - y^2 is -5.75 (at y = 0.5); the difference is 18. Hence option (c).