Drag a statement or reason into the blank to complete this proof; if −2(x+1)=8, then x=−5. −2(x+1)/−2 = 8−2 simplifying x+1−1=−4−1 simplifying options to fill in the blank: subtraction property of equality division property of equality distributive property of equality x + 1 + -4 x = -5

Can someone me with this problem i don't understand i need

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 value of y will make the inequality y< -1 false?