Question 578327
{{{7x(5-x)=14}}}divide by 7
{{{x(5-x)=2}}} open the brackets
{{{5x-x^2=2}}}
{{{-x^2+5x-2=0}}} multiply by -1
{{{x^2-5x+2=0}}}
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
{{{x = (-(-5) +- sqrt( (-5)^2-4*1*2))/(2*1) }}}
{{{x[1]=(5 + sqrt( 17))/2 }}}
{{{x[2]=(5 - sqrt( 17))/2 }}}