Question

what should be added to 3x2 + xy + 2y²
obtain 3x2 +5xy​

Answer 1

Answer:

$4xy - 2y {}^{2} should \: be \: added \: to \: get \: 3x {}^{2} + 5xy$

Answer 2

Step-by-step explanation:

k=x^2+5xy-2y^2

I hope it helps you