a) Xx(-2x+1)+3Xx(X-2)
Xx(-2X+1+3(x-2))
Xx(-2X+1+3X-6)
Xx(X-5)
b)(2X+3)x(X-1)+(3X-2)x(X+5)
2X\2-2X+3X-3+3X\2+15X-2X-10
5X\2+14X-13
c)(-5X)x(3X-1)+(15X+7)x(X-3)
-15X\2+5X+6X-2+15X\2-45X+7X-21
-27X-23
d)(X-1)x(-5X+3)+5Xx(X-1)
(X-1)x(-5X+3+5X)
(X-1)x3
3(X-1)
f)(2X+1)x(2X+2X+1)+1-8Xx3
(2X+1)x(4X+1)+1-24X
8X\2+2X+4X+1+1-24X
8X\2-18X+2