The expression 2a(b2-1) -4ab2(9+2) can also be written as?
"2a(b^2-1)-4ab^2(9+2)"
"=2ab^2-2a-4ab^2(11)"
"=2ab^2-2a-44ab^2"
"=-2a-42ab^2"
"=-2a(1+21b^2)"
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