The sum of −15x2 −5x + 11 and another polynomial expression is −9x2 + 3x −10. what is the other polynomial expression?

The factorization of 8x3 -125 is (2x-5)(jx2 +kx+25)

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents

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) = .