a) 2x(x - 4) - 5x =
= 2x * x - 2x * 4 - 5x =
= [tex]2x^{2} - 8x - 5x =[/tex]
= [tex]2x^{2} - 13x[/tex]
b)
7x - 3(x + 8) =
= 7x - 3 * x - 3 * 8 =
= 7x - 3x - 24 =
= 4x - 24
c)
2x(a - 3) + 4(x - 2) =
= 2x * a - 2x * 3 + 4 * x - 4 * 2 =
= 2ax - 6x + 4x - 8 =
= 2ax - 2x - 8
:)
