Question

What is the value of x

Answer 1

AD and CD are equal in length, therefore:-

3x + 3 = x + 9

2x + 3 = 9

2x = 6

x = 3 answer

Answer 2

AD = CD

3x + 3 = x + 9

2x = 6

x = 3

Answer: Last option

x = 3