Question

(у-4)*(у+4)-(у-3)^2 как решить

Answer 1

${y}^{2} - 16 - ( {y}^{2} - 6y + 9) = \\ = {y}^{2} - 16 - {y}^{2} + 6y - 9 = \\ = - 25 + 6y$