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If α and β are the zeros of x2 – (5 + 7k)x + 35k, such that α2 + β2 = 172 is then the value of k is _______

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If α and β are the zeros of x<sup>2</sup> – (5 + 7k)x + 35k, such that α<sup>2</sup> + β<sup>2</sup> = 172 is then the value of k is _______






 
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