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= -12x² - 20x
= 12x² + 20x
b) (2a + 8)(3a - 2)
= 2a.3a + 8.3a - 2.2a - 2.8
= 6a² + 24a - 4a - 16
= 6a² + 20a - 16
b.) (2a+8) (3a-2) = 2a(3a-2)+8(3a-2)
=6a²-4a+24a-16
=6a²+20a-16
c.) (5k-3) (2k²+2k+1) = 5k(2k²+2k+1) -3(2k²+2k+1)
= 10k³+10k²+5k-6k²-6k-3
= 10k³+10k²-6k²+5k-6k-3
= 10k³+4k²-k-3