(6-2x)² = 6²-2·6·2x+2x² = 36-24x+2x²
(5-3x)(5+3x)+(5+3x)² = 5²-(3x)²+5²+2·5·3x+3x² = 25-9x²+25+30x+3x² = 50-3x+30
(5-3x)(5+3x)+(5+3x)² = 5²-(3x)²+5²+2·5·3x+9x² = 25-9x²+25+30x+9x² = 50+30x
(5-3x)(5+3x)+(5+3x)² = 5²-(3x)²+5²+2·5·3x+(3x)² = 25-9x²+25+30x+9x² = 50+30x
6-2x)² = 6² -2·6·2x +4x² = 36 -24x +4x² )
ולכן:2X^2זה 2^2כפול X^2.