Question

A scientist uses the rule C(t) = 2t^2 - 9t - 1 to measure current in a wire. At what time t in seconds (t is greater than or equal to 0) will the current be 4 amps?

Answer 1

Replace C with 4.

Answer 2

and then?

Answer 3

I got up to 5 = 2t^2 - 9t.

Answer 4

ok use 2t^2 - 9t.-5=0 and solve for t

Answer 5

OHHH . Omigosh i must be retarded. THANK YOUUUUU ~