Question

solve the equation, cos^2(x)-cos(x)=2 in the domain of 0 is less than or equal to x and x is less than or equal to 2π.

Answer 1

X=pi

Answer 2

how do you get that answer?

Answer 3

Cos^2(pi)=1 and cos(pi)=-1.1--1=1+1=2. I actually just did it mentally.

Answer 4

Thank you so much!!!

Answer 5

can you also help me with one more problem?

Answer 6

Certainly!

Answer 7

Great!
Calculate the distance between the two points (t, u-2) and (t-2, u). Please use radical form in your solution.

Answer 8

Do you know how to solve it?

Answer 9

The solution is 2(2^(1/2)). We use the formula d=((x_2-x_1)^2+(y_2-y_1)^2)^(1/2) with x_2=t, x_1=t-2, y_2=u-2, and y_1=u. Sorry it took a while to reply. I'm typing on an iPad.

Answer 10

No problem! Thank you so much!

Answer 11

what does the underscore stand for?

Answer 12

That's to indicate a subscript since I can't type that on an iPad.

Answer 13

ok

Answer 14

so the answer is 2(2^1/2)?

Answer 15

Yes. That x^(1/2) is the same as the square root of x.

Answer 16

wait so my answer is 2(2√x) ???