Explications étape par étape:
A=(x+3)(x-1)
=x×x+x×(-1)+3×x+3×(-1)
=x²-x+3x-3
=x²+2x-3
B=(4t-3)(8t-1)
=4t×8t+4t×(-1)-3×8t-3×(-1)
=32t²-4t-24t+3
=32t²-28t+3
C=(4y - 1)(3 - y2)
=4y×3+4y×(-2y)-1×3-1×(-2y)
=12y-8y-3+2y
=6y-3
D= (-v+3)(20 - 602)
=-v×20-v×(-602)+3×20+3×(-602)
=-20v-602v+60-1806
=-582-1746
