please help! image is below,
If b = 45, and c = 4 , then a = ___ units.

Answer:
14
Step-by-step explanation:
By intersecting tangent and secant theorem:
[tex] {a}^{2} =c(b + c) \\ \\ {a}^{2} = 4(4 + 45) \\ \\ = 4 \times 49 \\ \\ a = \sqrt{4 \times 49} \\ \\ a = 2 \times 7 \\ \\ a = 14[/tex]