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Mathematics, 30.10.2020 05:50 latresyn

Find the sum (5a { }^{2} +7ab - 3b {}^{2} ) + (3a {}^{2}  - ab - 6b {}^{2})

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2a {}^{2}  + 8ab + 3b {}^{2}
8a {}^{2}  + 7ab - 3b {}^{2}
8a {}^{2}  + 6ab - 9b {}^{2}
12a {}^{2}  + 2ab - 9b {}^{2}

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