Test 1 Section 3 Number 16

One way to go here is to know the difference of two squares: we can factor t^2-4!


That tells you that t must be either 2 or –2.

Since the question told you that t>0, you know the answer must be 2.

You can also get this just by solving more traditionally, and that won’t take much longer.

    \begin{align*}t^2-4&=0\\t^2&=4\\t&=\pm 2\end{align*}

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