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= 13x - 15y
B. 12+2(4x-3) = 12+8x-6
= 12-6+8x
= 6+8x
C. a(a+3b) + 2a(4a+5b)
= a^2 + 3ab + 8a^2 + 10ab
= a^2 + 8a^2 + 3ab + 10ab
= 8a^4 + 13a^2b^2
Note: pangkat (^) kalo yang c saya agak ragu tolong dicek lagi ya