How do I solve:
c^2=-15-8c

Question

How do I solve:
c^2=-15-8c

anonymous · Answer

x=-3,x=-5

solomonzelman · Answer

$\Large\color{blue}{    c^2=-15-8c }$
add 8c to both sides,
 $\Large\color{blue}{    c^2+8c=-15 }$

it is the same question as the last time, except that there the variable was z, and here it is c.

salazarblack · Answer

are you familiar with this formula? http://upload.wikimedia.org/math/5/6/4/5646d4fbfc6422d507dce0f4a17f74a8.png

radar · Answer

continuing:  $$c^2 + 8c + 15 = 0$$

radar · Answer

Solve by factoring.  It factors easily.

solomonzelman · Answer

or add 16 to both sides, when it was ...=-15   and complete the square .

radar · Answer

Completing the square also works nicely.  Hey you have been provided three different ways to solve this.  It is your choice.

solomonzelman · Answer

3??!  quadratic formula is only a rescue way, when you can't factor, and when it is difficult to complete the square.. if you know what I mean....

solomonzelman · Answer

I would say that there are 2 ways, and another backup $\Large\color{blue}{  :) }$

salazarblack · Answer

but isn't it easier just to use the formula?

salazarblack · Answer

by factoring x1,x2 can be 3 and 5