Question 46254
Solve by using the quadratic formula. x2 – 8x – 9 = 0 
AX^2+BX+C=0 IS THE STD.EQN..A=1,B=-8,C=-9
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
{{{x = (-(-8) +- sqrt( (-8)^2-4*1*(-9) ))/(2*1) }}} 
{{{x = (8 +- sqrt( 64+36 ))/(2) }}} 
{{{x = (8 +- 10)/(2) }}}
X=9 OR -1