Odpowiedź:
x2 - 4x + 4 + 9 -6x+x2= 1 - 4 +4 +9 -6+1= 5
4a2 -20a+25+25a2-20a+4=4+20+25+25+20+4=98
16-16n+4n2-9n2-24n+16=16+8+1-2,25+12+16=49,75
