(1/3)(b^2+ab+a^2)-(1/4)(b^2+2ab+a^2)(adsbygoogle = window.adsbygoogle || []).push({});

= (b-a)^2

--------

12

I am ok with this but there is am intermediate step shown

(b^2-2ab+a^2)

-------------- (2)

12

I don't see where the multiplication by 2 comes from and it is not shown in the errata.

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# Homework Help: Mistake in my book?

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