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Well if 3x-1 = 11 then 3x = 12 12/3=4

x=4

x^2+x=4^2+4

4^2+4 = 20

Hope this is of help to you. :]

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14y ago
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Q: If 3 x minus 1 equals 11 what is the value of x 2 plus x?
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