Ok im back what's 9(2x + 15)= 45

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 (%)

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2

I’m really confused and need your assist me with this question i’ve never been taught