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What is the principal square root of 64?
a. -8
b. 4
c. -4
d. 8

1 Answer

3 votes

Final answer:

The principal square root of 64 is the positive root, which is 8, as per convention when seeking the principal square root.

Step-by-step explanation:

The principal square root of 64 is the positive square root, which is 8. This is because when you multiply 8 by itself (8 x 8), you get 64.

The other square root, -8, is also mathematically correct as (-8) x (-8) equals 64, but when a question asks for the principal square root, it is conventionally seeking the positive one.

Hence, the correct answer is d. 8.

User Robert Mark Bram
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