18. a) From the sum of 5x + 3y - 2z and 2x - 2y + 5z subtract 3x + y + z
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Answer:
4x+2z
Step-by-step explanation:
(5x+3y-2z)+(2x-2y+5z)
=keeping all like terms with each other
=5x+2x+3y-2y-2z+5z
=7x+y+3z------------(1)
Now subtracting 3x+y+z from equation (1)
=(7x+y+3z)-(3x+y+z)
=7x+y+3z-3x-y-z
=putting like term with each other,
=7x-3x+y-y+3z-z
=4x+2z
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