In the diagram, BC ≅ EF and ∠A and ∠D are right angles. Right triangles A B C and D F E are shown. Angles B A C and E C F are right angles. The hypotenuses of both triangles are congruent. The length of side E D is 4 x + 2 and the length of corresponding side B A is 34. For the triangles to be congruent by HL, what must be the value of x? 8 9 17 34