Question 882424
Previously Posted
x^2-4x+9 = 0  Format ax^2 + bx + c = 0
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
{{{x = (4 +- sqrt( 16-36 ))/(2) }}}
{{{x = (4 +- sqrt( -20 ))/(2) }}}
{{{x = (4 +- sqrt( -1*4*5 ))/(2) }}}
{{{x = (4 +- 2isqrt(5 ))/(2) }}}
x = 2 ± i√5