Question

How can you simplify this? :/
4^2=5^2+x^2-25xcos0.6

Answer 1

\[0=x^2-(25*cos(.6))x+9\]
how abt using the quadratic formula and solve for x?

Answer 2

Yes, I did reach to this, but I got 20 and 8 and I believe that's wrong :/

Answer 3

https://www.wolframalpha.com/input/?i=0%3Dx%5E2%2B25*cos%28.6%29x%2B9

Answer 4

Its bothersome that Cos(.6) is not a whole number

Answer 5

Ahhhh, I got it. There was a mistake in the question. It's 10cos0.6x not 25 :p Thanks for your help!

Answer 6

np :)