Question 156718
{{{2x^2 + 8x + 15 = 0}}}
Use the quadratic formula
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
where {{{a = 2}}}
{{{b = 8}}}
{{{c = 15}}}
{{{x = (-8 +- sqrt( 8^2-4*2*15 ))/(2*2) }}}
{{{x = (-8 +- sqrt( 64 - 120 ))/4 }}}
{{{x = (-8 +- sqrt( -56 ))/4 }}}
{{{x = (-8 +- 2*sqrt(14)i)/4 }}}
{{{x = -2 + (sqrt(14)i / 2) }}} and
{{{x = -2 - (sqrt(14)i / 2) }}}
I checked one of the answers, and it appeared to
check OK