Question 519719
x = a certain number
.
2x^2 +3x = 90
.
2x^2 +3x -90 = 0
.
factor
.
(2x +15)(x -6) = 0
.
x = -15/2 or 6
.
{{{ graph(500,500,-10,10,-100,100,2*x^2+3*x-90) }}}