The answer is in the picture below I used the square rooting method hope this is the answer you need!
Try downloading math papa I just did to get your answer
You will be adding 4 to the x-axis because it is positive, to go left you would subtract. Then you would be subtracting 2 to the y axis because you are going down. To go up you would add.
A(0,0)
+4,-2
A'(4,-2)
B(2,0)
+ 4,-2
B'(6,-2)
C(3,4)
+4,-2
C'( 7,2)
D(0,4)
+4,-2
D'(4,2)
I believe the answer is 50
