a+sqrt(144-a^2)=20

Input

a + sqrt(144 - a^2) = 20

Alternate form

a + sqrt(12 - a) sqrt(a + 12) = 20

Complex solutions

a = 10 - 2 i sqrt(7)
a = 10 + 2 i sqrt(7)

Roots in the complex plane

Roots in the complex plane