Question

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Answer 1

Answer:

1.(2x+y)$^{2}$

2.$a^{2} -4b^2$

3.$0$

4.$-a^4+2a^2b^2-b^4$

Step-by-step explanation:

Answer 2

Answer:

$\mathbb {ANSWER}$

$1. (2x + {y}^{2} )$

$2. {a}^{2} - {b}^{2}$

$3.0$

$4. - {a}^{4} + {2a}^{2} {b}^{2} - {b}^{4}$