Find the value of p for which the quadratic equation (2p+1) x2 - (7p+2) x + (7p-3) =0 has equal roots.
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determinant is square of cofficient of x minus 4times product of cofficient of x2 and the constant.
if D(deteminant)>0real and distinct roots exists
if D=0 equal roots exists
ifD<0 imaginary roots exists or no real roots exists
if D(deteminant)>0real and distinct roots exists
if D=0 equal roots exists
ifD<0 imaginary roots exists or no real roots exists
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