Select the approximate values of x that are solutions to f(x) = 0, where f(x) = -4x^2 + 9x + 7
f(x) = -4x² + 9x + 7
Since f(x) = 0, -4x² + 9x + 7 = 0
Solving by the quadratic formula: a = -4, b = 9, and c = 7
x = (-9 ± √[ 9² - 4(-4)(7) ] ) / ( 2(-4) )
x = ( -9 ± √[ 193] ) / ( -8 )
x = 2.862 or -0.6116
