Express 64 as the sum of consecutive odd numbers that is used in the pattern $n^3$ (for $n=4$): 64 = 13 + 15 + 17 + 19. How many odd numbers are added?

Cube roots of negatives are real numbers (unlike square roots).

∛$(-n)$ = −∛$n$.

Example: ∛(−125). $125=5^3$. So ∛$(-125)=-5$.

This is one place where square root and cube root behave differently — square roots of negatives are NOT real (they're imaginary, a Class 11 topic). Cube roots of negatives are perfectly normal.