Respostas

2014-03-26T23:01:30-03:00
70t +3t² = 200

3t² + 70t  - 200 = 0

a =3
b = 70
c = - 200

Δ = b² -4.a.c

Δ= 70² - 4.3.(-200) ~> 7300



t1  = - 70 - √
7300 /2.3  ~> - 25,9067

t2 = -70 + √ 7300 /2.3 ~> 2,573