Question

Zapisz w jak najprostszej postaci: a) 2(5x-7y)-(3y-7x) b)(5+2x)(3x-2) c)2x(4x-1)-(x-2)(x+2)

Answer 1

a) 2(5x-7y)-(3y-7x)=

=10x-14y-3y+7x=

=17x-17y

b)(5+2x)(3x-2)=

=15x-10+6x kwadrat -4x=

6xkwadrat+2x-10

c)2x(4x-1)-(x-2)(x+2)=

=8xkwadrat-2x-(xkwadrat + 2x-2x-4)=

=8xkwadrat-2x-xkwadrat-2x+2x+4=

7xkwadrat-2x+4

Answer 2

a) =10x-14y-3y+7x=17x-17y

b)=15x-10+6x(x do kwadratu)-4x=11x-10+6xkwadrat

c)=8xkwadrat-2x-xkwadrat+4x-4=7xkwadrat+2x-4