Question

please tell me answers ​

Answer 1

Step-by-step explanation:

$8)(a {}^{2} - b {}^{2} + 2ab + 4) - (a {}^{2} + 4ab - b {}^{2} - 5) \\ =(a {}^{2} - b {}^{2} + 2ab + 4) -a {}^{2} - 4ab + b {}^{2} + 5 \\ = 2ab + 9$

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