Question about Texas Instruments TI-30XA Calculator

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How do i solve the equations (r-3)(r+6)=0 using my ti-30xa

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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

and

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

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With the calculator: You cannot. By hand you can. In fact when a polynomial is factored out, you know its roots.
P(x)=(X-3)*(X+6).
If this equation is to be verified, then one of the two factors must be equal to zero.

  1. If the first factor is zero then X-3=0 and X=3
  2. If the second factor is to be equal to zero, then X+6=0 and X=-6.
  3. Hence your solutions are X1=3, and X2=-6

Posted on Jul 15, 2011

  • k24674 Jul 15, 2011

    P(x)=(X-3)*(X+6)=0
    If this equation is to be verified, then one of the two factors must be equal to zero. etc..

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