$$-(t+5) \times (t-20)$$
$-\left(t-20\right)\left(t+5\right)$
$$\left(-t-5\right)\left(t-20\right)$$
$$-t^{2}+20t-5t+100$$
$$-t^{2}+15t+100$$
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$100+15t-t^{2}$