If sum of the squares of the roots of the equation x^2+kx-b=0 is 2b, then what is k equal to?
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idk
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निम्नलिखित वाक्यों में मुख्य तथा गौण कर्म छाँटिएनिम्नलिखित वाक्यों में मुख्य तथा गौण कर्म छाँटिए
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