c) 12ab + 21ab3 + 30a²b2 – 6 by 3a²b2
d) 3x4 + 6x3 + 3x2 - 6x by 3x
a) x +
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Step-by-step explanation:
d) 12+18+6-18bx^2y
=32-18bx^2y
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