Question

State an equation you could use to find the value of $x$. Then find the value of $x$ in simplest radical form.

Short answer

The required value of $x$ is,

$x=\sqrt{51}$

Step-by-step solution

Step 1. Given information.

We have given a figure as shown below,

Step 2. Use Pythagorean Theorem concept.

From Pythagorean Theorem,

we know that in a right triangle, the square of the hypotenuse is equal to the sum of the squares of the legs.

The given triangle is right triangle.

Therefore,

$\begin{array}{c}{x}^2+7^2={10}^2\\ x^2={10}^2-7^2\\ =100-49\\ =51\end{array}$

Step 3. Taking square root. 

we get,

$x=\pm \sqrt{51}$

Step 4. Neglect negative sign.

Since, square root is positive quantity

So, we neglect negative sign.

The required value of $x$ is, $x=\sqrt{51}$.