Question 1108993
How do you mean, "solve"?
Do you want to factorize the expression?  Do you want to simplify the expression?  I'll assume this.



{{{4x(2x+1)+3(2x+1)}}}
Start with Distributive Property.


{{{8x^2+4x+6x+3}}}


{{{8x^2+10x+3}}}