Solve 2x^2 - 1 < 0

Question

Solve the inequality

Solve the inequality by testing the values in the interval

Solve for x

- \frac{2}{2} < x < \frac{2}{2}

Alternative Form

x \in (- \frac{2}{2}, \frac{2}{2})

Evaluate

2 x^{2} - 1 < 0

Rewrite the expression

2 x^{2} - 1 = 0

Move the constant to the right-hand side and change its sign

2 x^{2} = 0 + 1

Removing 0 doesn't change the value,so remove it from the expression

2 x^{2} = 1

Divide both sides

\frac{2 x ^{2}}{2} = \frac{1}{2}

Divide the numbers

x^{2} = \frac{1}{2}

Take the root of both sides of the equation and remember to use both positive and negative roots

x = \pm \frac{1}{2}

Simplify the expression

More Steps

x = \pm \frac{2}{2}

Separate the equation into 2 possible cases

x = \frac{2}{2} x = - \frac{2}{2}

Determine the test intervals using the critical values

x < - \frac{2}{2} - \frac{2}{2} < x < \frac{2}{2} x > \frac{2}{2}

Choose a value form each interval

x_{1} = - 2 x_{2} = 0 x_{3} = 2

To determine if x < - \frac{2}{2} is the solution to the inequality,test if the chosen value x = - 2 satisfies the initial inequality

More Steps

x < - \frac{2}{2} is not a solution x_{2} = 0 x_{3} = 2

To determine if - \frac{2}{2} < x < \frac{2}{2} is the solution to the inequality,test if the chosen value x = 0 satisfies the initial inequality

More Steps

x < - \frac{2}{2} is not a solution - \frac{2}{2} < x < \frac{2}{2} is the solution x_{3} = 2

To determine if x > \frac{2}{2} is the solution to the inequality,test if the chosen value x = 2 satisfies the initial inequality

More Steps

x < - \frac{2}{2} is not a solution - \frac{2}{2} < x < \frac{2}{2} is the solution x > \frac{2}{2} is not a solution

Solution

- \frac{2}{2} < x < \frac{2}{2}

Alternative Form

x \in (- \frac{2}{2}, \frac{2}{2})

Show Solution