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1 solution
from given equation, we have
a^1/2+b^1/2=c^1/2 and squaring both side ------>
(a^1/2+b^1/2)^2=(c^1/2)^2 i.e
a+b+2x(a^1/2)x(b^1/2)=c i.e a+b-c= (-) 2x(a^1/2)x(b^1/2)
now again squaring both side, we have
(a+b-c)^2=4ab