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What is the sum of cubes of the roots of (x^2-7x-18=0)?
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Answer and explanation
Correct answer: (721)
The sum of roots is (7) and the product is (-18). (\alpha^3+\beta^3=(\alpha+\beta)^3-3\alpha\beta(\alpha+\beta)=343+378=721).
Frequently asked questions
What is the correct answer to this question?
(721)
Why is this the correct answer?
The sum of roots is (7) and the product is (-18). (\alpha^3+\beta^3=(\alpha+\beta)^3-3\alpha\beta(\alpha+\beta)=343+378=721).
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Quadratic Equations. Topic: Introduction to Quadratic Equations.
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