Solve for x 3x^2-7=0

$3 x^{2} - 7 = 0$

Step 1

Add $7$ to both sides of the equation.

$3 x^{2} = 7$

Step 2

Divide each term in $3 x^{2} = 7$ by $3$ and simplify.

Divide each term in $3 x^{2} = 7$ by $3$ .

$\frac{3 x^{2}}{3} = \frac{7}{3}$

Simplify the left side.

Cancel the common factor of $3$ .

Cancel the common factor.

$\frac{3 x^{2}}{3} = \frac{7}{3}$

Divide $x^{2}$ by $1$ .

$x^{2} = \frac{7}{3}$

Step 3

Take the specified root of both sides of the equation to eliminate the exponent on the left side.

$x = \pm \sqrt{\frac{7}{3}}$

Step 4

Simplify $\pm \sqrt{\frac{7}{3}}$ .

Rewrite $\sqrt{\frac{7}{3}}$ as $\frac{\sqrt{7}}{\sqrt{3}}$ .

$x = \pm \frac{\sqrt{7}}{\sqrt{3}}$

Multiply $\frac{\sqrt{7}}{\sqrt{3}}$ by $\frac{\sqrt{3}}{\sqrt{3}}$ .

$x = \pm \frac{\sqrt{7}}{\sqrt{3}} \cdot \frac{\sqrt{3}}{\sqrt{3}}$

Combine and simplify the denominator.

Multiply $\frac{\sqrt{7}}{\sqrt{3}}$ by $\frac{\sqrt{3}}{\sqrt{3}}$ .

$x = \pm \frac{\sqrt{7} \sqrt{3}}{\sqrt{3} \sqrt{3}}$

Raise $\sqrt{3}$ to the power of $1$ .

$x = \pm \frac{\sqrt{7} \sqrt{3}}{{\sqrt{3}}^{1} \sqrt{3}}$

Raise $\sqrt{3}$ to the power of $1$ .

$x = \pm \frac{\sqrt{7} \sqrt{3}}{{\sqrt{3}}^{1} {\sqrt{3}}^{1}}$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x = \pm \frac{\sqrt{7} \sqrt{3}}{{\sqrt{3}}^{1 + 1}}$

Add $1$ and $1$ .

$x = \pm \frac{\sqrt{7} \sqrt{3}}{{\sqrt{3}}^{2}}$

Rewrite ${\sqrt{3}}^{2}$ as $3$ .

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{3}$ as $3^{\frac{1}{2}}$ .

$x = \pm \frac{\sqrt{7} \sqrt{3}}{{(3^{\frac{1}{2}})}^{2}}$

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$x = \pm \frac{\sqrt{7} \sqrt{3}}{3^{\frac{1}{2} \cdot 2}}$

Combine $\frac{1}{2}$ and $2$ .

$x = \pm \frac{\sqrt{7} \sqrt{3}}{3^{\frac{2}{2}}}$

Cancel the common factor of $2$ .

Cancel the common factor.

$x = \pm \frac{\sqrt{7} \sqrt{3}}{3^{\frac{2}{2}}}$

Rewrite the expression.

$x = \pm \frac{\sqrt{7} \sqrt{3}}{3^{1}}$

Evaluate the exponent.

$x = \pm \frac{\sqrt{7} \sqrt{3}}{3}$

Simplify the numerator.

Combine using the product rule for radicals.

$x = \pm \frac{\sqrt{7 \cdot 3}}{3}$

Multiply $7$ by $3$ .

$x = \pm \frac{\sqrt{21}}{3}$

Step 5

The complete solution is the result of both the positive and negative portions of the solution.

First, use the positive value of the $\pm$ to find the first solution.

$x = \frac{\sqrt{21}}{3}$

Next, use the negative value of the $\pm$ to find the second solution.

$x = - \frac{\sqrt{21}}{3}$

The complete solution is the result of both the positive and negative portions of the solution.

$x = \frac{\sqrt{21}}{3}, - \frac{\sqrt{21}}{3}$

Step 6

The result can be shown in multiple forms.

Exact Form:

$x = \frac{\sqrt{21}}{3}, - \frac{\sqrt{21}}{3}$

Decimal Form:

$x = 1.52752523 \dots, - 1.52752523 \dots$

Solve for x 3x^2-7=0

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