add ln(8) and ln(8)
Let's calculate: ln(8) + ln(8)
ⓘ Group like terms by adding their coefficients: ln(8) + ln(8) = 2×ln(8)
2×ln(8)
ⓘ The logarithm of a power is a multiple of the logarithm, ln(an) = n×ln(a): ln(8) = ln(23) = 3×ln(2)
2×3×ln(2)
ⅰ 2×3 = 6
▶Result:   6×ln(2)
The numeric value of: 6×ln(2) equals:
6×≈ 0.6931
▷ ≈ 4.1589