Answer
$2a^2-16ab$
Work Step by Step
Add the polynomials then combine like terms to obtain:
$=4a^2-10ab-b^2+(-2a^2)+(-6ab)+b^2
\\=(4a^2-2a^2)+(-10ab-6ab)+(-b^2+b^2)
\\=2a^2+(-16ab)+0
\\=2a^2-16ab$
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