Math majors...need your help
 

I'm shooting for a BC in computer science, hence I need to take numerous mathmatics courses. Well the sad part is I'm REALLY awful at factoring and I'm all the way into Business Calc at this point. So can someone please factor this one for me? :lol:

-x^2 - 36x + 6400 = 0

This is embarrassing. :oops:

Re: Math majors...need your help
 

6400=x^2 + 36x

80 = x + 6x

80 = 7x

x=11.428.....

Probably wrong.

You lost an x.

x=-b (+ and -) SQRT(b^2-4ac)/2a

x = -100 and -64

I got X=64 but I'm old and rusty :roll:

Where'd the b come from?

Never mind. I'm too old. My head hurts...... :P

Yes, don't factor it. Use the quadratic formula. Much easier.

jwikoff99 is right. The two possible solutions are -64 and -100, however, when you plug both in for x you will find that only -100 =0.

Ooh, good point. Always remember to check all possible solutions... unlike me. ;)

If you factor it its -(x-64)(x+100)...but you could also use the quadratic formula to find it.

So that would make +64 an answer.

Checks work (again)... Looks good.