Changes

C: ({lv=A}^{lv=B}+20)^0.5   With A=2, B=3 the result is C=5.29

C: ({lv=A}^{lv=B}+20)^0.5 with A=2, B=3 the result is C=5.29

In words square root of (A to the power of B plus 20)

In words square root of (A to the power of B plus 20)