ZAD 2 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) g) (2x do potęgi 4 -y)(x do potęgi 4 +y) h) (ab-a(2ab+6a) i) (7pr2+2r)(2pr2-7)

ad.a (x+1)(x+2)=x2+2x+x+2=x2+3x+2 ad.b (3a+4)(a-5)=3a2-15a+4a-20=3a2-11a-20 ad.c (2t+1)(1-3t)=2t-6t2+1-3t=-6t2-t+1 ad.d (3ab-7)(3-7ab)=9ab-21a2b2-21+49ab=-21a2b2+58ab-21 ad.e (x-y)(5x+6y)=5x2+6xy-5xy-6y2=5x2+xy-6y2 ad.f (x+5y)(7x-y)=7x2-xy+35xy-5y2=7x2+34xy-5y2 ad.g (2x do potęgi 4 -y)(x do potęgi 4 +y)=2x16+2x4y-x4y-y2=2x16+x4y-y2 ad.h (ab-a(2ab+6a)=ab-2a2b-6a2 ad.i (7pr2+2r)(2pr2-7)=14p2r4-49pr2+4pr4-14r

a) (x+1)(x+2)= x2+2x+x+2=x2+3+2 b) (3a+4)(a-5)=3a2-15a+4a-20=3a2-11a-20 c) (2t+1)(1-3t)=2t-6t2+1-3t=6t2-t+1 d) (3ab-7)(3-7ab)=9ab-21ab2-21+49ab=-21ab2+58ab-21 e) (x-y)(5x+6y)=5x2+6xy-5xy-6y2=5x2-6y2+1x2 f) (x+5y)(7x-y)=8x2-xy+45xy-5y2=8x2+44xy-5y2

a) (x+1)(x+2)= x2+2x+x+2=x2+3x+2 b) (3a+4)(a-5)=3a2-15a+4a-20=3a2-11a-20 c) (2t+1)(1-3t)= 2t-6t2+1-3t=-t-6t2+1 Niestety musze juz leciec wiec wiecej narazie nie zrobie ;p