Question 42155
Okay, from
7x^2 + 2x - 2 = 0, we have
x = (-2 ± sqrt(4 - 4*7*(-2))) / 14
x = (-2 ± sqrt(4 + 56)) / 14
x = (-2 ± sqrt(60)) / 14
x = (-2 ± 2*sqrt(15)) / 14
x = (-1 ± sqrt(15)) / 7