Question

1. 5y - 7x + 4y - 3y + 5x - 2x + 1

2. - 4x + 3y - z + 5y - 4 )

3. ( 3x² + 3y² - 1 ) ( - 3 x² )

Answer 1

1) 5y - 7x + 4y - 3y + 5x - 2x + 1

- 7x - 2x + 5x + 5y + 4y - 3y + 1 

- 9x + 5x + 9y - 3y + 1

- 4x + 6y + 1 

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2) (- 4x + 3y - z + 5y - 4)

- 4x + 3y - z + 5y - 4

- 4x + 3y + 5y - z - 4

- 4x + 8y - z - 4

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3) (3x² + 3y² - 1) (- 3x²)

- (3x² + 3y² - 1) 3x²

- 3 (3x² + 3y² - 1) x²