Finding the axis of symmetry of its graph y=3x^2-18x+1​

Can someone me with this problem . show your work .

Acompany that manufactures and sells guitars made changes in their product range. from the start they had 20 models. then they reduced the number of models to 15. as a result, the company enjoyed a 10% increase in turnover. - how much did the stock level change? in (%)

Select the graph of the solution. click until the correct graph appears. |x| = 3