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10x^{2}-108x+370
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10x^{2}-108x+370
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x^{2}+6x+9+9x^{2}-114x+361
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(-3x+19\right)^{2}.
10x^{2}+6x+9-114x+361
Combine x^{2} and 9x^{2} to get 10x^{2}.
10x^{2}-108x+9+361
Combine 6x and -114x to get -108x.
10x^{2}-108x+370
Add 9 and 361 to get 370.
x^{2}+6x+9+9x^{2}-114x+361
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(-3x+19\right)^{2}.
10x^{2}+6x+9-114x+361
Combine x^{2} and 9x^{2} to get 10x^{2}.
10x^{2}-108x+9+361
Combine 6x and -114x to get -108x.
10x^{2}-108x+370
Add 9 and 361 to get 370.
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