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Quadratic equations : Solve the quadratic equation 2x^2 + ax – a^2 = 0 for x.

Solve the quadratic equation 2x2 + ax – a2 = 0 for x.

The quadratic equation px² – 2 px + 15 = 0 has two equal roots, then find the value of p.

If x = 3 , is a solution of the quadratic equation 3x²+ 2kx – 3 = 0, find the value of k.