Question 885892
f(x) = -9x^2 + 8x + 5
0=-9x^2 + 8x + 5    use quadratic equation
{{{ formula }}} {{{x = (-8 +- sqrt( 8^2-4*(-9)*5 ))/(2*-9)}}}
x = (1/9) 4 +- sqrt61
which leads to about x=1.312  and x=-0.423