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It depends on your application? I had one on a construction site and it was wonderful. Look up the particular model and see if it applies to you Obiri. Thank you and leave some feedback for I'm a newbie!
If it is not accessible (grayed out) then the context is inappropriate. The reason could be the misuse of the verb solve. A lot of people confuse calculate with solve. If you care to tell us what you were trying to do, exactly, maybe we can help.
You can do it two ways. Graphically: Open the graph utility, enter a function y1= expression(x) where expression(x) is the polynomial. Graph the function y1(x). Play with the window dimensions to display the interesting part of the graph. You can then see if there are any zeros (roots). While the graph is displayed, press SHIFT F5 (G-Solv). Press F1:Root to look for a root. Read the value of the root at the bottom of the screen (to the left).
Solve utility Open the QEquation solver, select F2:polynomial, or F3: solver. The polynomial solve can solve polynomial equations up to degree 6. The solve solve polynomial and any other type of non algebraic equations
Whay would you want to go through the hassle of writing a program to solve to solve a quadratic equation`The calculator has two buit-in command to do just that. It has Solve and cSolve (for complex solutions).
Open a calculator sheet, and on the command line, type in solve(ax^2+bx+c=0, x), press ENTER and wait for the solutions