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If 4a^{2} - 10ab - 6 b^{2} = 20 and 2a + b = 2, then 3a - 9b = ?

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Adrianviz
[tex]4 a^{2} -10ab-12 b^{2} =20 \\ 2(2a+b)(a-3b)=20 \\ Since 2a+b = 2 \\ 4(a-3b)=20 \\ a-3b=5 \\ 3(a-3b)=15[/tex]