Question
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Tutor-Verified Answer
Answer
a. False
c. True
d. True
c. True
d. True
Solution
a. False
- For any real number
, the square is nonnegative. Therefore, a perfect square (which is of the form ) cannot be negative.
c. True
- The cube of a number can be negative. For example, if
, then , which is negative. Thus, a perfect cube (of the form ) may be negative.
d. True
- In the context of real numbers, the square root of a negative number is not defined because there is no real number
such that is negative. (Note: In the complex number system, we define , but the statement is typically considered within the real number system.)
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Bonus Knowledge
A perfect square is defined as a number that can be expressed as the square of an integer. Since squaring any real number (positive or negative) results in a non-negative number, it’s impossible for a perfect square to be negative. Therefore, statement (a) is false.
When it comes to perfect cubes, any integer can be cubed, and this includes negative numbers. For example,
. Thus, a perfect cube can indeed be negative, making statement © true.
As for the square root of a negative number, in the realm of real numbers, it does not exist; however, in the field of complex numbers, it can be expressed using ‘i’ (the imaginary unit). Hence, the statement is true if considering only real numbers.