Answer:
[tex]3 {a}^{2} + 4ab - 3 {b}^{2} = 4 + 56 \sqrt{10} \div 3[/tex]
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Answer:
hence proved
[tex]3 {a}^{2} + 4ab - 3 {b}^{2} = 4 + 56 \sqrt{10} \div 3[/tex]