To show that ∆ADB is congruent to ∆CBD by AAS , the value of x must be 13
Congruent triangles are triangles with equal corresponding angles and equal corresponding side lengths
If ∆ADB is congruent to ∆CBD
then;
angle A = angle C
therefore;
6x - 1 = 4x + 25
collect like terms
6x - 4x = 25 + 1
2x = 26
x = 26/2
x = 13
Therefore, To show that ∆ADB is congruent to ∆CBD by AAS , the value of x must be 13