Question 411272
Why don't you simplify the left side, then combine like terms all on to one side to produce a single quadratic equation which can then be solved by the quadratic formula:
{{{(4x+10)^2 = 2x^2+5x+14}}} Expand the left side.
{{{16x^2+80x+100 = 2x^2+5x+14}}} Combine like-terms.
{{{14x^2+75x+86 = 0}}} Use quadratic formula.
{{{x = (-75+-sqrt(75^2-4(14)(86)))/2(14)}}} Simplify.
{{{x = (-75+-sqrt(809))/28}}} Evaluate.
{{{x = -3.69}}} or {{{x = -1.66}}}