(√2x-1)(1+√2x)-(√5x+1)(-√5x+1)=
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2x^2 -1 - (1 - 5x^2) = 2x^2 - 1 -1 + 5x^2 = 7x^2 - 2
=√2x+2x²-1-√2x-(-5x²+√5x-√5x+1)=
=2x²-1+5x²-1=
=7x²-2
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2x^2 -1 - (1 - 5x^2) = 2x^2 - 1 -1 + 5x^2 = 7x^2 - 2
(√2x-1)(1+√2x)-(√5x+1)(-√5x+1)=
=√2x+2x²-1-√2x-(-5x²+√5x-√5x+1)=
=2x²-1+5x²-1=
=7x²-2
licze na naj