# ASVAB Mathematics Knowledge Practice: Cube and Square Roots

Some questions on the Mathematics Knowledge subtest on the ASVAB are guaranteed to be totally radical. Not in the ’80s sense, but because they deal with numbers that are square and cube roots of other numbers.

## Practice questions

## Answers and explanations

- The correct answer is
**Choice (D).**First evaluate the expression inside the square root symbol by filling in the value of

*x*:Find

by determining that

- The correct answer is
**Choice (C).**Both radicals are cube roots, so multiply the radicands. Because

you get

Factor and simplify, and look for perfect cubes to make it easier:

Rewrite the numbers and variables as the product of radicals so you continue to work with like terms:

Solve what you can and simplify: