Answer:
AB =12
Step-by-step explanation:
Since the base angles are the same, the sides are the same length
4x = 2x+6
subtract 2x from each side
4x-2x = 2x+6-2x
2x = 6
Divide by 2
2x/2 =6/2
x =3
AB =4x
=4(3)
