The function on a ti-89 that gives you the zeros of a quadratic equation is called just that "zeros". To access it from the home screen, press f2 and select the label called "zeros(" then type the function and define the variable. For example:
if you want the zeros of y=x^2+7x+12 you the display should read:
zeros(x^2+7x+12,x), press enter and it will give you the results in this case {-3, -4}.
We can check if it did it right by factoring this simple quadratic. 0=x^2+7x+12 factors as 0=(x+3)(x+4) set the factors equal to zero:
x+3=0 x=-3
x+4=0 x=-4
So we see that the calculator did it right! That is always a good thing. This will work for most polynomial functions.
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By using the quadratic formula. -b +/- sqrt(b^2-4ac)/2a a = 2 b = 8 c = 5 -8 +/- sqrt(8^2-4(2)(5))/2(2) -8 +/- sqrt(64-40)/4 -8 +/-sqrt(24)/4 X = -0.7752551286 X = -3.224744871 my TI-84 graphing calculator confirms this. you may want that exact answer
graphing calculators only. TI-83 and TI-84 calculators.
On the TI-30x model there is no INV button. You have to use the 10^x function. To do this press the button labeled "2nd" and then the button labeled LOG. Above the LOG button you should see the 10x function which is the same for INV.
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55 = 3125 5 x 5 x 5 x 5 x 5 = 3125 The answer can be obtained via a calculator or by the use of logarithms.