Choose the appropriate answer for rephrasing the underlined portion of the sentence.
Although the square root of a negative number has no real value, it is not necessarily true that equations involving imaginary numbers like these are practically inapplicable.
Explanation:
As per the sentence, negative numbers have no real value and there may not be practical applications to the equations involving these numbers. Option 1 implies that the imaginary numbers are inapplicable. Thus it changes the meaning of the sentence and can be negated. Option 2 correctly paraphrases the underlined part of the given sentence. Retain it. Option 3 is grammatically incorrect. The phrase ‘there is’ should be followed by ‘no practical application’ to retain the subject verb agreement. Thus it and can be negated. Option 4 is also grammatically incorrect because of the phrase ‘inapplicable practically’. Hence, the correct answer is option 2.
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