Question

9x2 + y² - ________ make the following perfect trinomial square​

Answer 1

Answer:

So the blank should be filled by 6xy

Step-by-step explanation:

9x² + y²

= (3x)² + y²

= (3x)² + y² +2×3x ×y - 2×3x ×y

= (3x+y)² - 2×3x ×y

= (3x+y)² - 6xy

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