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= 3x +15
b. 8x² -20x
c. 3a³ +5a²
d. 3x² -12x +9
b. 2x(4x-10) = 8xkuadrat - 20
c. 3a(a kuadrat+2a)= 3a pangkat3 + 6a kuadrat
d. 3(x kuadrat -4x +3) = 3xkuadrat -12x +9
Cara :
3(x+5) = 3 dikali x = 3x
3 dikali 5 = 15
jadi, 3x + 15