(√5+x)²+2(√5 x-1)²-(√5 x-3)(√5 x+3)=5+2√5 x+x²+2(5x²-2√5 x+1)-(5x²-9)=
=5+2√5 x+x²+10x²-4√5 x+2-5x²+9=14-2√5 x+6x²
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(√5+x)²+2(√5 x-1)²-(√5 x-3)(√5 x+3)=5+2√5 x+x²+2(5x²-2√5 x+1)-(5x²-9)=
=5+2√5 x+x²+10x²-4√5 x+2-5x²+9=14-2√5 x+6x²