Posted by **ladybug** on Saturday, September 29, 2012 at 11:29pm.

solve the the following inequality. write your solution in interval notation.

x^3-49x<0

_ (I don't know how to make the sign on my computer)

- pre-calculus -
**Reiny**, Sunday, September 30, 2012 at 8:12am
x^3 - 49x < 0

x(x^2 - 49) < 0

x(x+7)(x-7) < 0

consider f(x) = x(x+7)(x-7)

the x-intercepts would be -7, 0, 7

Knowing the basic shape of a cubic, we have

x < -7 OR 0 < x < 7

I will let you write that in the interval notation that you learned.

## Answer this Question

## Related Questions

- pre-calculus - solve for the follow inequality. write your solution in interval ...
- pre calculus - Solve the following inequality and write using interval notation ...
- math - solve the following inequality. write your solution in interval notation ...
- math - solve the follow inequality. write your solution in interval notation. x^...
- calculus - solve the following inequality. write your solution in interval ...
- pre-calculus - please help me with thisone thanks solve the inequality ...
- calculus - solve the following inequality. write your solution in interval ...
- Solve Inequality - Solve the inequality. Express your solution using interval ...
- calculus - use a sign chart to solve inequality. Express answers in interval ...
- algebra URGENT HELP - analyze the graph of the following function solve R(x)=x(x...

More Related Questions