(1/2)9.81 $t^{2}$ -90t-150=0
-A√
$5x^{2}$ +2x(1+6x)
4=77x=33x+40
(x-1)(x-4)=0
$(m-n)^{2}$ +6*(m+n)+9
(n-3)!/(n-5)!
-3 $\sqrt{-64}$
x=
(t-5)^5