Question 950449
{{{2x^2 - 13x +21 = 2x^2+ 9x-56}}}Subtract {{{2x^2}}} from each side.
-13x+21=9x-56 Add 56 to each side.
-13x+77=9x Add 13x to each side.
77=22x Divide each side by 22.
77/22=x
3.5=x ANSWER: The common solution is x=3.5.
CHECK
{{{2x^2 - 13x +21 =0}}}
{{{2(3.5)^2-13(3.5)+21=0}}}
{{{2(12.25)-45.5+21=0}}}
{{{24.5-45.5+21=0}}}
{{{0=0}}}
{{{2x^2+ 9x-56=0}}}
{{{2(3.5)^2+9(3.5)-56=0)}}}
{{{2(12.25)+31.5-56=0}}}
{{{24.5+31.5-56=0}}}
{{{0=0}}}