Question
How much is x - 2y + 3z greater than 3x + 5y - 7?
✓
Answer
Required expression:
= (x - 2y + 3z) - (3x + 5y - 7)
= x - 2y + 3z - 3x - 5y + 7
Collecting positive and negative like terms together, we get
x - 3x - 2y + 5y + 3z + 7
= -2x - 7y + 3z + 7
= (x - 2y + 3z) - (3x + 5y - 7)
= x - 2y + 3z - 3x - 5y + 7
Collecting positive and negative like terms together, we get
x - 3x - 2y + 5y + 3z + 7
= -2x - 7y + 3z + 7
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