Answer:
x = [tex]\sqrt{193}[/tex]
Step-by-step explanation:
The given is a right triangle and in right triangles the square value of hypotenuse is equal to sum of other two side lengths' square value
12^2 + 7^2 = x^2
144 + 49 = x^2
193 = x^2
x = [tex]\sqrt{193}[/tex]
