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Instructions

 Each question is followed by two statements, I and II. Mark the answer
 

Question 79

If α and β are the roots of the equation $$(ax^2+bx+c=0)$$, then what is the value of $$(α^2 +β^2)$$?  
I.$$α+β=\frac{-b}{a}$$
II.$$αβ =\frac{c}{a}$$

Solution

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$$(α^2 +β^2)$$ can be reduced to $$(α+β)^2 - 2(αβ)$$
Now as we can see, we need both values of (α+β) and (αβ) to solve the equation.
Hence answer will be D.

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