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Programming your calculator
6
QUADEQTN
Purpose
Finding the roots of a quadratic equation, using the quadratic formula.
Operation
The program reminds you of the form of the equation: ax
2
+ bx + c = 0. You may have
to rewrite your equations into this form before entering them.
Input the three coefficients in the correct order, pressing after each.
Test the program by finding the solutions to the equation:
x
2
= 10 – x
In this case, first rewrite the equation to the appropriate form, x
2
+ x – 10 = 0 to see that
the coefficients are A = 1, B = 1 and C = -10.
The two approximate solutions are x = 2.702 and x = -3.702.