Zadanie1 Wykonaj mnożenie . a) (2x-1)(y-3) b) ( x -y)(a-b+9) Zadanie2 Wykonaj mnożenie i zredukuj wyrazy podobne. A) (x+1)(x+2) B) (3a+4)(a-5) C) ( 2t+1)(1-3t) D) (3ab-7)(3-7ab) E) ( -x+y)(5x+6y) F) (x+5y)(7x-y)

1. a) (2x-1)(y-3) 2xy-6x-y+3 y(2x-1)-3(2x-1) (2x-1)(y-3) x1=1/2 x2=3   b) ( x -y)(a-b+9) ax-bx+9x-ay+by-9y   2. A) (x+1)(x+2) x^2+2x+x+2 x(x+1)+2(x+1) (x+1)(x+2) x1=-1 x2=-2   B) (3a+4)(a-5) 3a^2-15a+4a-20 3a(a-5)+4(a-5) (a-5)(3a+4) x1=5 x2=-4/3   C) ( 2t+1)(1-3t) 2t-6t^2+1-3t 2(1-3t)+1(1-3t) (1-3t)(2+1)   D) (3ab-7)(3-7ab) 3ab-21a^2b^2-21+49ab -21a^2b^2+51ab-21 / :3 -7a^2b^2+17ab-7 delta=4-4*(-7)*(-7) delta<0   E) ( -x+y)(5x+6y) -5x^2-6yx+5yx+6y^2 -x(5x+6y)+y(5x+6y) (5x+6y)(-x+y)   F) (x+5y)(7x-y) 7x^2-yx+35yx-5y^2 x(7x-y)+5y(7x-y) (7x-y)(x+5y)

zad.1 a)2xy-6x-y+3 b)ax-bx+9x-ay+by-9y   zad.2 a)x^2+2x+x+2=x^2+3x+2 b)3a^2-15a+4a-20=3a^2-11a-20 c)2t-6t^2+1-3t=-6t^2-t+1 d)9ab-21a^2b^2-21+49ab=-21a^2b^2+58ab-21 e)-5x^2-6xy+5xy+6y^2=-5x^2+6y^2-xy f)7x^2-xy+35xy-5y^2=7x^2-5y^2+34xy