Question about Texas Instruments TI-30XA Calculator
If you expand that formula into r^2 +3r - 18 = 0, then you can use the quadratic formula.
The two solutions for r are:
r = (-3 + sqrt((-3)^2 -4(1)(-18))) / 2(1) = 3
r = (-3 - sqrt((-3)^2 -4(1)(-18))) / 2(1) = -6
Try typing those in using the calculator to get the same results.
Posted on May 25, 2011
With the calculator: You cannot. By hand you can. In fact when a polynomial is factored out, you know its roots.
If this equation is to be verified, then one of the two factors must be equal to zero.
Posted on Jul 15, 2011
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Posted on Jan 02, 2017
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