Problem2. Do all parts.
Parta. Graph $P(x) = 3x(x + 1)(x - 5)$, showing clearly all $x$- and $y$-intercepts
Partb. Find the maximum or minimum value of the quadratic function $g(x) = 2x^2 + 6x + 3$.
Partc. For the graph $x^2 + 3y^2 = 5$, find the coordinates of a focus.
Partd. A man invests $5000 in an account that pays 8.5% interest per year, compounded quarterly. How long will it take for the investment to reach $12000?