If the quadratic equation px2 –2√5px + 15 = 0 has two equal roots then find the value of p.
The quadratic equation 
has two equal roots
D = b2 - 4ac = 0
= 
= 20p2 - 60p = 0
= 20p (p - 3) = 0
p = 0 or p = 3
For p = 0 in the equation 0 + 0 + 15 = 0 but this is not possible
Thus p
0
p = 3
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