Respuesta :

√p + 4 + 4 = p
√p  = p - 8
square both sides:-
p  = p^2 - 16p + 64
p^2 - 17p + 64 = 0 

p = 11.372 ,  5.628

Substitute these back into the original equation to check for extraneous roots

p = 11.372 is a genuine root but 5.628 is not

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