Use the quadratic formula to solve it:
Y= -6x^2 +100x -180
a= -6
b= 100
c= -180
x = [-b +- sq root(b^2 - 4ac)] / 2a
x = [-100 +- sq root (10,000 -4*-6*-180)] / -12
x = [-100 +- sq root (10,000 -4,320)] / -12
x = [-100 +- sq root (5,680)] / -12
x1 = (-100 +
75.3658
) / -12
x1 =
24.6342 / -12
x1 = -2.05285
x2 = (-100
-
75.3658
) / -12
x2 = (-
175.3658
) / -12
x 2 = 14.6138
