Find the area of the following figure below

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area

In the diagram, the ratios of two pairs of corresponding sides are equal to prove that almn - axyz by the sas similarity theorem, it also needs to be shown that x 6 z un z zz un = 2x zləzz lezy

Which of the following is the best first step in solving the equation below? 4+2㏒³x=17