Question

what should be added to a² + 2ab + y² to obtain 3a² - ab?
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Answer 1

So x^2 + 2xy - y^2 must be added.

Missing: a² + ‎3a² -

Let "a" be added to x^2 + xy +y^2 to obtain 2x^2 + 3xySo a = 2x^2 + 3xy - (x^2 + xy + y^2)= ...

Answer 2

Answer:

2a^2-3ab-y^2

Step-by-step explanation:

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