Differentiate w.r.t. t
-\frac{21t^{2}}{2}
Evaluate
-\frac{7t^{3}}{2}
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3\left(-\frac{7}{2}\right)t^{3-1}
The derivative of ax^{n} is nax^{n-1}.
-\frac{21}{2}t^{3-1}
Multiply 3 times -\frac{7}{2}.
-\frac{21}{2}t^{2}
Subtract 1 from 3.
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