The number of of employeesn(a)of a company that has existed for 15 years has increased during the first 5 years but has been decreasing since. This problem can be written asn(a) = -8(a-5)^2 + 230in whicharepresents the number of years since the company started.During how many years the number of employees was higher than the number of employees when the company started?Is the initial number of employees 230? If it is here's what I tried:

231 = -8(a-5)^2 + 230I substract 230 from both sides. so...1 = -8(a-5)^2After this I don't know what to do. And if that equation isn't right then I'm even more confused!

thanks