[tex]a)x( {x}^{2} - 1) + 2x(4 + {x}^{2} ) - 3(4x - {x}^{2} ) = {x}^{3} - x + 8x + 2 {x}^{3} - 12x + 3 {x}^{3} = 6 {x}^{3} - 5x[/tex]
[tex]b) {a}^{2} (b - ab) - a( {b}^{2} - {a}^{2} b) = {a}^{2} b - {a}^{3} b - a {b}^{2} + {a}^{3} b = {a}^{2} b - a {b}^{2} [/tex]
[tex]c) - \frac{1}{2} a( - 4 {b}^{2} - 2ab) = 2a {b}^{2} + {a}^{2} b[/tex]
Pozdrowionka! ~Wika
