Solve for M square root of 2M=4

$\sqrt{2 M} = 4$

To remove the radical on the left side of the equation, square both sides of the equation.

${\sqrt{2 M}}^{2} = 4^{2}$

Simplify each side of the equation.

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

${({(2 M)}^{\frac{1}{2}})}^{2} = 4^{2}$

Simplify the left side.

Simplify ${({(2 M)}^{\frac{1}{2}})}^{2}$ .

Multiply the exponents in ${({(2 M)}^{\frac{1}{2}})}^{2}$ .

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

${(2 M)}^{\frac{1}{2} \cdot 2} = 4^{2}$

Cancel the common factor of $2$ .

Cancel the common factor.

${(2 M)}^{\frac{1}{2} \cdot 2} = 4^{2}$

Rewrite the expression.

${(2 M)}^{1} = 4^{2}$

Simplify.

$2 M = 4^{2}$

Simplify the right side.

Raise $4$ to the power of $2$ .

$2 M = 16$

Divide each term in $2 M = 16$ by $2$ and simplify.

Divide each term in $2 M = 16$ by $2$ .

$\frac{2 M}{2} = \frac{16}{2}$

Simplify the left side.

Cancel the common factor of $2$ .

Cancel the common factor.

$\frac{2 M}{2} = \frac{16}{2}$

Divide $M$ by $1$ .

$M = \frac{16}{2}$

Simplify the right side.

Divide $16$ by $2$ .

$M = 8$