Lines AB and AC are tangent to the smaller circle at points

Last updated: 8/7/2022

Lines AB and AC are tangent to the smaller circle at points B and C respectively. Line AC and AD are tangent to the larger circle at C and D respectively. Determine the length of AC if line AB is 7 x + 1 metres long and line AD is 2 x + 2 metres long. Express your answer as an exact value. AC=