This is the concept of quadratic equations, to find out whether the two expressions we need to expand each of them: (x)=(25+10x)(300-36x) (x)=25(300-36x)+10x(300-36x) (x)=7500-900x+3000x-360x^2 (x)=7500+2100x-360x^2
Expanding equation 2? (x)=(100+20x)(100-12x) (x)=100(100-12x)+20x(100-12x) (x)=10000-1200x+2000x-240x^2 (x)=10000+800x-240x^2 considering the lead coeffienct 7500+2100x-360x^2≠10000+800x-240x^2
