A number multiplied by itself 3 times is denoted by the number, say, x, to the power of 3, or x cubed:
x³
a shorthand way of saying
x · x · x
Since you want to know which number cubed is equal to 81, set this equal to 81.
x³ = 81
Take the cube root of each side (or calculate 81 to the [tex] \frac{1}{3} rd [/tex] power).
x ≈ 4.3267
Answer:
x ≈ 4.3267
