[-2+(-3)]/2=-5/2; Substitute √x=y+5/2 into the given equation and rearrange to (y+1/2)^4+(y-1/2)^4-1=2[y^4+6(1/2)^2*y^2+(1/2)^4]-1=2y^4+3y^2-7/8=0 or (y^2)^2+(3/2)y^2-7/16=0 yields y^2=[-(3/2)±2]/2=1/4 or -7/4. From y^2=1/4, y=±1/2. √x=y+5/2=3 or 2 and x=3^2=9 or 2^2=4.
[-2+(-3)]/2=-5/2; Substitute √x=y+5/2 into the given equation and rearrange to
(y+1/2)^4+(y-1/2)^4-1=2[y^4+6(1/2)^2*y^2+(1/2)^4]-1=2y^4+3y^2-7/8=0 or
(y^2)^2+(3/2)y^2-7/16=0 yields y^2=[-(3/2)±2]/2=1/4 or -7/4.
From y^2=1/4, y=±1/2. √x=y+5/2=3 or 2 and x=3^2=9 or 2^2=4.