설정 a=(2,-3),b=(-4,0),c=(-5,6),구-2a+3b-4c

설정 a=(2,-3),b=(-4,0),c=(-5,6),구-2a+3b-4c

풀다.
a=(2,-3)
b=(-4,0)
c=(-5,6)
-2a+3b-4c
=(-2×2+3×(-4)-4×(-5),-2×(-3)+3×0-4×6)
=(4,-18)