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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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