Dear teacher please help in the following question and explain it ​

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Answers 1

Answer:

-7x³ -2x² +3x +7

Step-by-step explanation:

Let us take the unknown number as xx + 5x² - 3x + 1 = 3x² - 7x³ +8

x= 3x² - 7x³ +8 - (5x² - 3x + 1)

x=3x² - 7x³ +8 -5x² + 3x -1

x= -7x³ + 3x² - 5x² + 3x -1 + 8

x=-7x³ -2x² + 3x +7

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