POLYNOMIAL FUNCTIONS Solving Polynomial Equations (Page 1 of 6)

Let's solve the equation 9x^5-12x^4-5x^3+66x^2-76x+24 = 0. Consider the expression on the left side of the equation to be the polynomial function f(x) = 9x^5-12x^4-5x^3+66x^2-76x+24. Then solving the equation is equivalent to finding all the zeros of this function, of which there are five (based on the degree). Enter this function as Y1, then try a standard window.

 Y= key. (Clear any previous functions)

 9 X,T,theta,n key. Caret key. 5 Minus key. 12 X,T,theta,n key. Caret key. 4 Minus key. 5 X,T,theta,n key.
 Caret key. 3 Plus key. 66 X,T,theta,n key. x-squared key. Minus key. 76 X,T,theta,n key. Plus key. 24

 Calculator screen image.
 ZOOM key. 6: menu selection. Calculator screen image.
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