Question

17) a) Subtract 5x² -6y² + 8y-9x from 7x² - 5xy + 10 y² + 5x - 4y​

Answer 1

Step-by-step explanation:

7x² - 5xy + 10y² + 5x - 4y - (5x² - 6y² + 8y - 9x)

= 7x² - 5xy + 10y² + 5x - 4y - 5x² - 6y² + 8y - 9x

= 7x² - 5x² - 5xy + 10y² - 6y² + 5x - 9x - 4y + 8y

= 2x² - 5xy + 4y² - 4x + 4y

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Answer 2

Step-by-step explanation:

$( {5x}^{2} - {6y}^{2} + 8y - 9x) - ( {7x}^{2} - 5xy + {10y}^{2} + 5x - 4y \\ = {5x}^{2} - {6y}^{2} + 8y - 9x - {7x}^{2} - 5xy + {10y}^{2} + 5x + 4y \\ = {5x}^{2} - {7x}^{2} - {6y}^{2} + {10y}^{2} - 9x + 5x + 8y - 4y - 5xy \\ = { - 2x}^{2} + {4y}^{2} - 4x + 4y - 5xy$

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