Hi, I just got done doing a bunch of trig stuff, which I understand fairly well, but my teacher included some algebra review problems with quadratic stuff, etc. and i can't remember how to do these for the life of me. Thank you for any and all help.

Solve the following equations without a calculator.

a. (x-7)(x+5) = 20

b. 2y^2 = y

c. 4y^2 = 1

d. 3y^3 + 2y^2 = 5y

e. 2y - (1/y) = 1