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I don't understand can someone help?

I don't understand can someone help?-example-1
User Andig
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The question is asking you to find the values of "t" that make this true.
.. 13 = 5 +23t -16t^2

This is a quadratic equation that can be solved in any of the usual ways.

Usually, it works well to start by putting the equation into standard form.
.. -16t^2 +23t -8 = 0 . . . . . . . . subtract 13 from the above equation

t = (-23 ±√(23^2 -4(-16)(-8)))/(2(-16))
.. = (-23 ±√17)/-32
.. = 23/32 ±(√17)/32
.. = {0.59, 0.85}

The ball will be at a height of 13 feet when t=0.59 and t=0.85.
I don't understand can someone help?-example-1
User Zeus
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