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If (x=4+\sqrt{7}) and (y=4-\sqrt{7}), what is the simplified form of (x-y)?
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Answer and explanation
Correct answer: (2\sqrt{7})
On subtracting, the (4) terms cancel and (\sqrt{7}-(-\sqrt{7})=2\sqrt{7}). Watch the signs carefully.
Frequently asked questions
What is the correct answer to this question?
(2\sqrt{7})
Why is this the correct answer?
On subtracting, the (4) terms cancel and (\sqrt{7}-(-\sqrt{7})=2\sqrt{7}). Watch the signs carefully.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Polynomials. Topic: Irrational numbers and real numbers.
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