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Simplify the (a+b)(a-b)+(b+c)(b-c)+(c+a...

Simplify the (a+b)(a-b)+(b+c)(b-c)+(c+a)(c-a)

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  15. Simplify the a(b-c)+b(c-a)+c(a-b)

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  16. Simplify the a(b-c)-b(c-a)-c(a-b)

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  17. Simplify the following: x(x+4) +2x(x-3) - 3x^2

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  18. Simplify the following: 3x^2 + x (x+2) -3x (2x +1)

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