Apply the cosine double angle identity to get:
Cos 2PI/3
So you reversed the subtraction a bit; the equation you're gonna be solving is

.
First step ya gonna do is to reverse the + and - symbols in the trinomial thats in the parentheses so your equation looks like

Now just combine like terms and your answer should be
It's 35 because 10 plus 5 is 15. You the subtract it by 50 and you get 35.
Answer:
y=3x^2+34
3x+y-10=0
Step-by-step explanation:
The Binomial Theorem is a quick way (okay, it's a less slow way) of expanding (or multiplying out) a binomial expression that has been raised to some (generally inconveniently large) power. For instance, the expression <span>(3x – 2)10</span><span> would be very painful to multiply out by hand. Thankfully, somebody figured out a formula for this expansion, and we can plug the binomial </span><span>3x – 2</span><span>and the power </span>10<span> into that formula to get that expanded (multiplied-out) form.</span>
The formal expression of the Binomial Theorem is as follows: