Simplify : 3a2 – 4ab + 7b2 + 15 – 6b2 + 5. *
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Step-by-step explanation:
3a^2 -4ab+7b^2 +15 +5 -6b^2
= 3a^2 -6b^2 +7b^2 -4ab +20
= 3a^2 + b^2 -4 ab +20
therefore -20 = 3a^2-4ab +b^2
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