Trigonometry+Quadratic

Level pending

If \(a_1\) and \(a_2\) are the two values of 'a' for which both roots of the quadratic equation \(9x^2\) + [\(3^a\)+15]x + 4 =0 are coincident, then |\(a_1\) - \(a_2\)| has the value equal to

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