Question

pomóżcie Ćwiczenie 3

Answer 1

a) (2x+y)(x+2y)=2x^2+4xy+xy+2y^2

b) (2x+y)(x-2y)=2x^2-4xy+xy-4xy

c) (a-2b)(a+2b)=a^2+2ab-2ab-4b^2

d) (3n-2)(n-6)=3n^2-18n-2+12

e)(x+2y+3)(x-2)=x^2-2x+2xy-4y+3x-6

f)(2a-b+c)(2a-3b)=4a^2-6ab-2ab+3b^2+2ac-3bc

g)(a+2b-3c)(2a-3b)=2a^2-3ab-4ab-6b^2-6ac+9ab

h)-4(x+3)(x-2)=-4+x^2-2x+x^2-6

i)2n(n-2m)(3+m)=2n+3n+mn-6m-2m^2