Ican't seem to work out this problem using quadratic formula. how do i do this problem?

Use the method of cylindrical shells to find the volume v generated by rotating the region bounded by the curves about the given axis.y = 7ex, y = 7e^-x, x = 1; about the y-axis

Pls as soon as ! will award brainliest and 20 ! also the answer is not 22.5 degrees! find the value of x in each case:

If f (x) = 2x2 +5/(x-2), complete the following statement: f(6) =