Which of the following choices shows the proper use of the distributive property? A. -2(6x - y) = -12x + 2y
B. -2(6x - y) = 12x + 2y
C. -2(6x - y) = 12x - 2y
D. -2(6x - y) = -12x - 2y
What’s the answer

What is f(3) for the quadratic functionf(x)=2x2 + x – 12? f -3g 3h 6i. 9

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) = .

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10