1b. Is (3x+1) a factor of 9x^3 + 6x^2 - 26x - 6? Explain your reasoning. (Make sure you identify the value of the remainder in your answer for a
complete explanation!) *
HEL

9/10 divide by -3/15 as a mixed number

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) = .

2/3(-6y+9x) expand each expression using the distributive property