Which are the solutions of x2 = –7x – 8?

You can start by rewriting the equation so that the right side equals zero. Add  and  to both sides.



You can now use the quadratic equation (below), where  and , to find solutions. Plug in these values for  and  into the equation and simplify.






The final answer is the combination of both solutions.


Or approximately...

X^2 = -7x -8

x^2 +7x +8 = 0

D = 49 -32 = 17

x_1,2 = (-7+/-sqrt17)/2 = (-7-sqrt17)/2 and (-7+sqrt17)/2

hope this will help you 

17 is c. congruent means equal in size