Simplify 3t(tn-5)

$3 t (t n - 5)$

Apply the distributive property.

$3 t (t n) + 3 t \cdot - 5$

Multiply $t$ by $t$ by adding the exponents.

Move $t$ .

$3 (t \cdot t) n + 3 t \cdot - 5$

Multiply $t$ by $t$ .

$3 t^{2} n + 3 t \cdot - 5$

$3 t^{2} n + 3 t \cdot - 5$

Multiply $- 5$ by $3$ .

$3 t^{2} n - 15 t$

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