Write all the values of p for which the quadratic equation x 2 + px + 16 = 0 has equal roots. Find the roots of the equation so obtained.

Write all the values of p for which the quadratic equation $x^2 + px + 16 = 0$

Write all the values of p for which the quadratic equation x² + px + 16 = 0 has equal roots. Find the roots of the equation so obtained.