Question

in that equation I have to solve for x.
5. x^3 + 2x^2 - 9x = 18


in this word problem i have to solve my factoring.
8. Suppose the altitude of a rising hot-air balloon is given by h = 0.04 t2 + 2t, where “t” is the time in seconds after the balloon leaves the ground. How long will it take for the balloon to reach an altitude of 200 feet?

Answer 1

PLEAse please

Answer 2

5. looks like "grouping"

x^3 + 2x^2 - 9x = 18
x^3 + 2x^2 - 9x - 18 = 0
x^2(x+2) - 9(x+2) = 0
(x+2)(x^2-9) = 0
(x+2)(x+3)(x-3) = 0
x = -2, -3, 3

Answer 3

Thank you so much you are a god..
can you pleas ehelp me wit h the word problem?

Answer 4

for the second, set
.04t^ + 2t = 200 , multiply by 100
4t^2 + 200t - 20000=0 , divide by 4
t^2 + 50t - 5000 = 0
(t+100)(t-50) = 0

take it from there.

Answer 5

Thank you a million Reiny.

Answer 6

solve for h
200=0.04(t*t)+2*t
200/0.4=t*t +2*t
5000=t*t+2*t
2500=t*t
square root of 2500=t
check answer

Answer 7

5000=t*t+2*t
2500=t*t ARGGGHHHH!!!!!

remember, whatever you do to one side you must do to the other.
You didn't.