Verified answer

Answer:

9x^2+6x+1

Step-by-step explanation:

(3x+1)(3x+1)=(3x•3x)+(3x•1)+(3x•1)+(1•1)=9x^2+3x+3x+1=9x^2+6x+1

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Answer:Search it in math

Step-by-step explanation:Learn it by ourselves