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A present age is (x) years. The product of the age after (9) years and the age (9) years ago is (2119). What is the present age?
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Answer and explanation
Correct answer: (46) years
((x+9)(x-9)=2119) gives (x^2-81=2119), so (x^2=2200). This is not a perfect square, so none of the given options is correct.
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What is the correct answer to this question?
(46) years
Why is this the correct answer?
((x+9)(x-9)=2119) gives (x^2-81=2119), so (x^2=2200). This is not a perfect square, so none of the given options is correct.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Quadratic Equations. Topic: Word Problems and Applications.
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