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এর মান কত?

Without solving the following quadratic equation, find the greater value of $p$ for which the given equation has real and equal roots. $x^2+(p-3)x+p=0$.

If the roots of the equation ${ x }^{ 2 }-8x+({ a }^{ 2 }-6a)=0$ are real, then

The set of all real values of $p$ for which the equation $x + 1 = \displaystyle \sqrt{px}$ has exactly one root is