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6xdikurang -3x,5kurang -6
b.-2x+y+7z dari(6x-5y-2z)dengan (-8x+6y+9z)
6x dikurang -8x,-5y dikurang 6y,-2 dikurang 9z
c.3(2x²-4x+5)+2(4x²+3x-7)
=6x²-12x+15+8x²+6x-14
=14x²-6x+1
moga bantu
maaf kalau caranya salah
= 6x+5-3x-6
= 6x-3x+5-6
= 3x-1
b 6x-5y-2z+(-8x)+6y+9z
= 6x-y-2z-8x+6y+9z
= 6x-8x-5y+6y-2z+9z
=-2x+y+7z
c. 3(2x²-4x+5)+2(4x²+3x-7)
= 6x²-12x+15+8x²+6x-14
= 6x²+8x²-12x+6x+15-14
= 14x²-6x+1