Answer:
Explanation:
$y = -16x^2 + 240x + 115$
$= -16x^2 + 240x + 120 - 5$
$= -16x^2 + 240x + 120 - 5x - 5x$
$= -16x^2 + 240x + 120 - 10x - 5x$
$= -16x^2 + 240x + 120 - 10x - 5x + x^2 - x^2$
$= -16x^2 + 240x + 120 - 10x - 5x + x^2 - x^2 + 2x - 2x$
$= -16x^2 + 240x + 120 - 10x - 5x + x^2 - x^2 + 2x - 2x + x -x$
$= -16x^2 + 240x + 120 - 10x - 5x + x^2 - x^2 + 2x - 2x + x -x + 3 - 3$
$= -16x^2 + 240x + 120 - 10x - 5x + x^2 - x^2 + 2x - 2x + x -x + 0