Question 379042
{{{(r-3)(r+5)=2}}}
{{{r^2+5r-3r-15=2}}}
{{{r^2+2r-15=2}}}
{{{r^2+2r-17=0}}}
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{{{r = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
 {{{r = (-2 +- sqrt( 2^2-4*1*(-17) ))/(2*1) }}}
{{{r = (-2 +- sqrt( 4+68 ))/(2) }}}
{{{r = (-2 +- sqrt( 72 ))/(2) }}}
{{{r = (-2 +- 6*sqrt( 2 ))/(2) }}}
{{{highlight(r = -1 +- 3*sqrt( 2 ) )}}}