a) 2(y²-y-12)= 2y²-2y-24
b) d(d²-d-6)= d³-d²-6d
c) x(x²-1)= x³-x
d) -0,2q(5q³+50q-2q²-20)= -q⁴+0,4q³-10q²+4q
e) 4p³(1-p)(p+6)= 4p³(p+6-p²-6p)= -4p⁵-20p⁴+23p³
