Question 398114
{{{20x^4-53x^2+18= (4x^2 - 9)(5x^2 - 2) = 0 }}}
==> {{{x^2 }}}= 9/4, 2/5
==> x = -3/2, 3/2, {{{-sqrt(2/5)}}},{{{ sqrt(2/5)}}}