Question 449814
{{{(7-x)^2 + x^2 = 9}}}

{{{49 - 14x + x^2 + x^2 = 9}}}

<==> {{{2x^2 - 14x + 40 = 0}}}

<==> {{{x^2 - 7x + 20 = 0}}}

Now use the quadratic formula to find the values of x.