What is the factor of this 3x - 12

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

Change negative exponents to positive, then solve