<PRE><B>Question 92399</B>
X^2+8X+7=0 {{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
X=(-8+-SQRT[8^2-4*1*7])/2*1
X=(-8+-SQRT[64-28])/2
X=(-8+-SQRT[36])/2
X=(-8+-6)/2
X=(-8+6)/2
X=-2/2
X=-1 ANSWER.
X=(-8-6)/2
X=-14/2
X=-7 ANSWER.
I DID THE FIRST TO SHOW YOU HOW IT IS DONE, NOW YOU FINISH THE REST OF THEM. </PRE>