wykonaj mnozenie i zredykuj wyrazy podobne. a)(x+1)(x+2) b)(2t+1)(1-3t) c)(x+5y)(7x-y) d)(ab-a) (2ab+6a)

a)(x+1)(x+2) x^2+ x+ 2x+ 2 = x^2 + 3x + 2 b)(2t+1)(1-3t) 2t - 3t + 1 - 6t^2 = -6t^2 - t + 1 c)(x+5y)(7x-y) 7x^2 + 5y^2 + xy + 35xy = 7x^2 + 5y^2 + 36xy d)(ab-a) (2ab+6a) 2(ab)^2 - 6a^2 + 6a^2b - 2a^2b = 2(ab)^2 - 6a^2 + 4a^b a^2 - oznacza a do potęgi drugiej .... i tak w każdym z przypadków :)

a (x+1)(x+2) x^2+ x+ 2x+ 2 = x^2 + 3x + 2 b (2t+1)(1-3t) 2t - 3t + 1 - 6t^2 = -6t^2 - t + 1 c (x+5y)(7x-y) 7x^2 + 5y^2 + xy + 35xy = 7x^2 + 5y^2 + 36xy d (ab-a) (2ab+6a) 2(ab)^2 - 6a^2 + 6a^2b - 2a^2b = 2(ab)^2 - 6a^2 + 4a^b