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Answer:
(1) 10x
(2) 6x²
(3) 3xyz
(4) -8x² + 7a²
Step-by-step explanation:
(1) 3x + 7x
10x
(2) 2x² + (-3x²) + 7x²
2x² - 3x² + 7x²
-x² + 7x²
6x²
(3) 7xyz + (-5xyz) + 9xyz + (-8xyz)
7xyz - 5xyz + 9xyz - 8xyz
16xyz - 13xyz
3xyz
(4) (x² + a²) + (-5x² + 2a²) + (-4x² + 4a²)
x² + a² - 5x² + 2a² - 4x² + 4a²
(x² - 5x² - 4x²) + (a² + 2a² + 4a²)
-8x² + 7a²
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