Zad. 3
[tex]a)\\(x+7)(y-2)=xy-2x+7y-14\\b) \\(2a-3)(5-b)=10a-2ab-15+3b\\c)\\(p-5)(t+3)=pt+3p-5t-15\\d)\\(3s-2)(5s+1)=15s^2+3s-10s-2=15s^2-7s-2[/tex]
[tex]e)\\(6-2x)(3x+1)=18x+6-6x^2-2x=-6x^2+16x+6\\f)\\(a+b)(2b-a)=2ab-a^2+2b^2-ab=-a^2+ab+2b^2\\g)\\(5x-3)(y-2)=5xy-10x-3y+6\\h)\\(3p^2+t)(t^2-4p)=3p^2t^2-12p^3+t^3-4pt[/tex]
