Coordinate Geometry

Question

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If a + b + c = 7 and ab + be + ca = 20, find the value of a² + b² + c².

Answer

We know that
(a + b + c)² = a² + b² + c² + 2 (ab +bc + ca)
⇒ (7)² = a² + b² + c² + 2(20)
⇒ a² + b² + c² = 9

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Some More Questions From Coordinate Geometry Chapter

Find the value of n, given (81)^5/n = 243.

Which of the following expressions are polynomials in one variable and which are not? State reasons for your answer.

4x² - 3x + 7

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