Question 330251
Use the quadratic formula, I'll show you with 1 and you do the rest.
{{{x^2-2x-13=0}}}
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{{{a=1}}}
{{{b=-2}}}
{{{c=-13}}} 
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{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{x = (-(-2) +- sqrt( (-2)^2-4*1*(-13) ))/(2*1) }}} 
{{{x = (2 +- sqrt( 4+52 ))/2 }}} 
{{{x = (2 +- sqrt( 56))/2 }}} 
{{{x = (2 +- 2sqrt( 14))/2 }}} 
{{{highlight(x = 1 +- sqrt(14)) }}}