If a and b are the roots of the given equation 3x² + 4x -6 = 0 then a² + b² =?
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a +b = 4
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let the roots of a and b be 'x'
a2 + b2 = 'x'.
x = a2 + b2 = a + b
= a + b = 4
x = ab 4
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