What are the solutions of the equation 9x4-2x2-7=0 ? Use u substitution to solve. x= ± square root of 7/9 and x= ± 1 x= ± square root of 7/9 and x= ± i x= ± i square root of 7/9 and x= ± 1 x= ± i square root of 7/9 and x= ± i Question Answer: x = 1 or x = -1 solved algebra 5 months ago 5923