7m^2-16m=8
7m^2 - 16m - 8 = 0
use quadratic formula:
a = 7, b = -16, c = -8
x = -b +- sqrt(b^2 - 4ac) / 2a
x = -(-16) +- sqrt[(-16)^2 - 4*7*(-8)]/2*7
x = 16 +- sqrt[256 - 224] / 14
x = 16 +- sqrt(32) /14
x = 16 - sqrt(32) / 14 or x = 16 + sqrt(32) / 14
x = 16 - 4sqrt(2) / 14 or x = 16 + 4sqrt(2) / 14
x = .74 or x = 1.55