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- 5 + 3x(x - 1) + ( wx - 1)( x+3) =
- 5 + 3 - 3x + 2 - x + 6x - 3 =
2x - 3
b)
3 - 2x(x + 2y) - (x - y)( 2x + y)=
3 - 2 - 4xt - 2 + 2xy - xy +
=
- 4 + 4 - 3xy
c)
(2a - b)(a + 3b) - ( a - 4b)( 2a + b) =
2 - ab + 6ab - 3 - 2 + 8ab - ab + 4 = + 12 ab
d)
-3x(x-1)(x - 2) - 9 =
- 3x( - x - 2x + 2) - 9 =
- 3 + 3 + 6 - 6x -9 = - 3 - 6x
e)
(a+2c)(a - c +2) - ac=
+ 2ac - ac - 2 + 2a + 4c - ac =
f)
(a - c)(2a + c - 3) + ac =
=