Subtract 8x - 9y + 4z from the sum of 5x + 4y + 5z and 5x - 6y + 7z.
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0
2+2=4
4+6= 10
10×6=60 hope it help
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= (5x + 4y + 5z) + (5x - 6y + 7z)
= 5x + 4y + 5z + 5x - 6y + 7z
= 5x + 5x +4y - 6y + 5z + 7z
= 10x - 2y + 12x
Then subtract 8x - 9y + 4z from 10x - 2y + 12x
= (10x - 2y + 12x) - (8x - 9y + 4z)
= 10x - 2y + 12x - 8x - 9y + 4z
= 10x - 8x - 2y - 9y + 12x + 4x
= 2x - 11y + 16z
Hope it helps..
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