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=2(-3) -3(2)(-4) +4(-3)
= -6 + 24 - 12
=6
4a-2bc+3c^2
=4(-3) - 2(2)(-4) +3(-4)^2
=-12 + 16 + 3×16
=-12+16+48
=52
koreksi saya kalau saya salah.