Finding roots on quadratic equations.

[yamaha356]

Hello all, just found this forum. I need help with two problems. I just did 38 of them no problem, but for some reason cannot figure these last two out!

Here is an example of one I got correct:

EX: x2 +10x = -25
x2 +10x + 25 = 0
(x + 5) (x + 5)

Answer: {-5,-5}



The two problems I cannot solve are:

17x = -x2 - 60

( Which will turn into x2 + 17x + 60 = 0 )

and

x2 - 12x +25 = 0




Can anyone please help me solve these?

 

[skeeter]

x^2 + 17x + 60 = 0
(x + 5)(x + 12) = 0

x^2 - 12x + 25 = 0
this one will not factor, use the quadratic formula ...

\(\displaystyle \L x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\)

a = 1, b = -12, c = 25

\(\displaystyle \L x = \frac{12 \pm \sqrt{44}}{2} = 6 \pm \sqrt{11}\)

 

[yamaha356]

Thanks a lot. I'll probably be back with more questions on the next set. I haven't been in school for over a month due to a surgery I had.