If f(x) = x^2 + 2x - 4 and g(x) = - 4x +1, what is (g-f)(x)?

I'm confused on this could anyone me and show me what i need to do to solve it.

Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid