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Answer:option C
Step-by-step explanation:
Answered by
1
Answer:
Option C : -5x + 16y + 6z - 8z²
Step-by-step explanation:
9x - 4y + 6z² + (-5x - 4y - z²)
= 9x - 4y + 6z² - 5x - 4y - z²
Re-arranging,
= 9x - 5x - 4y - 4y + 6z² - z²
= 4x - 8y + 5z² ... (i)
6z + 9y - 2z² + (- x - y - z²)
= 6z + 9y - 2z² - x - y - z²
Re-arranging,
= 6z - x + 9y - y - 2z² - z²
= 6z - x + 8y - 3z² ... (ii)
(ii) - (i)
6z - x + 8y - 3z² - (4x - 8y + 5z²)
= 6z - x + 8y - 3z² - 4x + 8y - 5z²
Re-arranging,
= 6z - x - 4x + 8y + 8y - 3z² -5z²
= 6z - 5x + 16y - 8z²
Re-arranging,
= -5x + 16y + 6z - 8z²
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