WB JEE 2017 | Quadratic Equations Question 33 | Mathematics

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MCQ (Single Correct Answer)

+2

-0.5

Let $$\alpha$$ and $$\beta$$ be the roots of $${x^2} + x + 1 = 0$$. If n be a positive integer, then $$\alpha$$ⁿ + $$\beta$$ⁿ is

A

$$2\cos {{2n\pi } \over 3}$$

B

$$2\sin {{2n\pi } \over 3}$$

C

$$2\cos {{n\pi } \over 3}$$

D

$$2\sin {{n\pi } \over 3}$$

2

WB JEE 2017

MCQ (Single Correct Answer)

+2

-0.5

For real x, the greatest value of $${{{x^2} + 2x + 4} \over {2{x^2} + 4x + 9}}$$ is

A

1

B

$$-$$ 1

C

$${1 \over 2}$$

D

$${1 \over 4}$$

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