Question

Please someone useful help me it's always people who answer who say they don't know the answer

Answer 1

Explanation:

the equation is 3-8*cos(x) = 7

plugging in 45° to Cos give
`√(2)` / 2

then the equations looks like

3-8* (
`√(2)` / 2) = y

3-4
`√(2)` = y

there is your answer... don't get rid of the square root.. that's an exact answer