Question

(3x+1)(x-1)-(3x-1)(3x+1) спростить выражение

Answer 1

$(3x + 1)(x - 1) - (3x - 1)(3x + 1) = 3 {x}^{2} + x - 3x - 1 - (3 {x}^{2} - 1) = 3 {x}^{2} - 2x - 1 - 3 {x}^{2} + 1 = - 2x$