Question 1010879
I can say:
{{{ ( 2x + sqrt(P) )^2 = 4x^2 + 4*sqrt(P)*x + P }}}
{{{ 4*sqrt(P) = 20 }}}
{{{ sqrt(P) = 5 }}}
{{{ P = 25 }}}
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Check:
{{{ 4x^2 + 20x + 25 = ( 2x + 5 )^2 }}}
{{{ ( 2x + 5 )^2 = 4x^2 + 20x + 25 }}}