x^4-10x^2+9=0
D Deleted member 4993 Guest Nov 8, 2007 #3 Re: equations quadratic in form Monster said: x^4-10x^2+9=0 Click to expand... substitute u = x^2 Then the equation becomes u^2 - 10u +9 = 0 (u-9)(u-1) = 0.......now continue.
Re: equations quadratic in form Monster said: x^4-10x^2+9=0 Click to expand... substitute u = x^2 Then the equation becomes u^2 - 10u +9 = 0 (u-9)(u-1) = 0.......now continue.
