Practice
Solve for x.a) -4x2 +8x−1 = 0
{0.134,1.866}
{0.134,1.866}
b) -4x2 +7x+9 = 0
{-0.8616,2.6116}
{-0.8616,2.6116}
c) 7x2 −8x−2 = 0
{1.3539,-0.211}
{1.3539,-0.211}
d) -5x2 +2x+7 = 0
{-1,1.4}
{-1,1.4}
e) -1x2 +x+2 = 0
{-1,2}
{-1,2}
f) 9x2 −4x−2 = 0
{0.7434,-0.2989}
{0.7434,-0.2989}
g) 4x2 −2x−9 = 0
{1.7707,-1.2707}
{1.7707,-1.2707}
h) -4x2 +5x+7 = 0
{-0.8381,2.0881}
{-0.8381,2.0881}
i) 8x2 −x−7 = 0
{1,-0.875}
{1,-0.875}
j) 9x2 −9x−1 = 0
{1.1009,-0.1009}
{1.1009,-0.1009}