Question

please answer and give explanation ​

Answer 1

Answer:

$1) \: {x}^{2} + 10x + 25 \\ 2) \: 9 {x}^{2} + 24x + 16 \\ 3) \: 9 {x}^{2} + 30xy + 25 {y}^{2} \\ 4) \: 1 + 20mn + 100 {m}^{2} {n}^{2}$

Step-by-step explanation:

because

${(x + y)}^{2} = {x}^{2} + 2xy + {y}^{2}$

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