Question

please help me out this questions
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Answer 1

a)

${3a}^{2} + 4ab - {b}^{2} + {7b}^{2} - 4ab + {2a}^{2} + { a}^{2} + {b}^{2}$

${3a}^{2} + {2a}^{2} + {a}^{2} + 4ab - 4ab - {b}^{2} + {7b}^{2} + {b}^{2}$

${6a}^{2} + 7 {b}^{2}$

Answer 2

Answer:

Step-by-step a0explanation:

I am not sure that answer is correct.