Question

Ex 7 va rog e urgent dau coroana!!!

Answer 1

Răspuns:

a) (a+1)^2-2(a+1)(b+1)+(b+1)^2 =

a^2+2a+1-2ab-2a-2b-2a+b^2+2b+1 =

a^2+a-2ab+b^2 =

= a^2-2ab+b^2

c) (-3x+5)^2-(3x-1)^2 =

(5-3x)^2-(9x^2-6x+1) =

25-39x+9x^2+6x-1 =

= 24-24x

b) (2x-3)^2+(4x-2)x(5-x) =

4x^2-12x+9+20x-4x^2-10+2x =

= 10x-1

d) (a+2b)^2-(a+1)^2-(2b+1)^2 =

a^2+4ab+4b^2-(a^2+2a+1)-(4b^2+4b+1) =

a^2+4ab+4b^2-a^2-2a-1-4b^2-4b-1 =

= 4ab-2a-2-4b

Explicație pas cu pas:

Scuze ca e prea direct , ma cam grabesc + ca e foarte multt