Compare: f(x) = 4 and g(x) = 2x2 - 13x + 9
What is the product of their y-intercepts?

Which term best describes the association between variables a and b

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line?

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) = .