Evaluate N=(t^2-t)/2

$N = \frac{t^{2} - t}{2}$

Step 1

Factor $t$ out of $t^{2}$ .

$N = \frac{t \cdot t - t}{2}$

Step 2

Factor $t$ out of $- t$ .

$N = \frac{t \cdot t + t \cdot - 1}{2}$

Step 3

Factor $t$ out of $t \cdot t + t \cdot - 1$ .

$N = \frac{t (t - 1)}{2}$

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