Question

PLEASE TELL ME THE ANSWER .

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Answer 1

$5 {y}^{2} + xy - 4 {x}^{2} + 4 {y}^{2} - 3 {x}^{2} - 6xy + 5xy + 7 {x}^{2} - 9 {y}^{2}$

(Everything gets cancelled. )

= 0

hope it helps you!

Answer 2

Answer:

iii) 18y² - 10xy - 14x² [You should write this way. This is the standard way of writing Algebraic Expression Answers]

Step-by-step explanation:

(5y² + xy - 4x²) + (4y² - 3x² - 6xy) + (5xy + 7x² - 9y²)

==> (5y² + 1xy - 4x²) + (4y² - 3x² - 6xy) + (5xy + 7x² - 9y²)

==> 5y² + 1xy - 4x²

+ 4y² - 6xy - 3x²

- 9y² + 5xy + 7x²

-(+)---- (-)------(-)-------

+ 18y² - 10xy - 14x²

Ans) + 18y² - 10xy - 14x² or 18y² - 10xy - 14x²

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