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Answer to Question #9918 in Algebra for Andy

Question #9918
Multiply (x^9+3)^2
Expert's answer
The well-known formula for squaring a sum of two numbers or terms is
[img width=196,height=40]http://images.planetmath.org/cache/objects/7427/js/img1.png[/img]
So due to it we obtain
(x^9+3)^2=x^{18}+6x^{9}+9

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