How do you multiply $(3t^2-2w)^2$ ?

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Answer 1 · 2015-07-09T12:50:38

$9t^4-12t^2w+4w^2$

Use the quadratic expansion:
$(a+b)^2=a^2+2ab+b^2$ with $a=3t^2$ and $b=-2w$
This gives:
$(3t^2-2w)^2=9t^4-12t^2w+4w^2$

How do you multiply (3t^2-2w)^2 (3t^2-2w)^2 ?