Question 828925
{{{2x+4x^2=42}}}
{{{4x^2+2x=42}}}
{{{4(x^2+(1/2)x+1/16)=42+4(1/16)}}}
{{{4(x+(1/4))^2=168/4+1/4}}}
{{{4(x+1/4)^2=169/4}}}
{{{(x+1/4)^2=169/16}}}
Two solutions:
{{{x+1/4=13/4}}} and {{{x+1/4=-13/4}}}
{{{highlight(x=12/4=3)}}} and {{{highlight(x=14/4=-7/2)}}}