Practice
Solve for x.a) -4x2 −7x+4 = 0
{-2.2038,0.4538}
{-2.2038,0.4538}
b) 2x2 +2x−1 = 0
{0.366,-1.366}
{0.366,-1.366}
c) -2x2 +7x+2 = 0
{-0.2656,3.7656}
{-0.2656,3.7656}
d) 4x2 −8x−8 = 0
{2.7321,-0.7321}
{2.7321,-0.7321}
e) -5x2 +8x+1 = 0
{-0.1165,1.7165}
{-0.1165,1.7165}
f) 9x2 −7x−6 = 0
{1.2933,-0.5155}
{1.2933,-0.5155}
g) 7x2 −6x−6 = 0
{1.4488,-0.5916}
{1.4488,-0.5916}
h) -2x2 −9x+9 = 0
{-5.3423,0.8423}
{-5.3423,0.8423}
i) -9x2 +5x+2 = 0
{-0.2694,0.8249}
{-0.2694,0.8249}
j) -6x2 −8x+1 = 0
{-1.4484,0.1151}
{-1.4484,0.1151}