9. From the sum of 4 + 3x and 5 - 4x + 2x², subtract 7x-9-x2 .
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Answer:
3x² - 8x + 18
Step-by-step explanation:
sum,
4 +3x + 5 - 4x + 2x²
=2x² - x + 9
subtraction,
2x² - x + 9 - (7x-9-x²)
=2x² - x + 9 - 7x + 9 + x²
=3x² - 8x + 18
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