1.

5a^2 - 7ab + 5b^2 from 3ab —2a^2 — 2b^2

Answer»

3ab - 2a*a - 2b*b - ( 5a*a - 7ab + 5b*b ) = 3ab - 2a*a - 2b*b - 5a*a + 7ab - 5b*b = 10ab - 7a*a - 7b*b

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