Question

VA ROG FRUMOS!!! IMI TREBUIE MÂINE​

Answer 1

Răspuns:

Explicație pas cu pas:

a)

(x + 2)^2 + (x - 1)^2 = x^2 + 4x + 4 + x^2 - 2x + 1 = 2x^2 + 2x + 5

b)

(x + 3)^2 + (2x + 1)^2 = x^2 + 6x + 9 + 4x^2 + 4x + 1 = 5x^2 + 10x + 10

c)

(3x - 5)(3x + 5) + (5x + 6)^2 - (x - 5)(x + 5) = 9x^2 - 25 + 25x^2 + 60x + 36 - x^2 + 25 = 33x^2 + 60x + 36

d)

(3x + 7)^2 - (4x - 5)^2 + (8x - 5)(8x + 5) - (7x + 2)(7x - 2) =

= 9x^2 + 49 + 42x - 16x^2 + 40x - 25 + 64x^2 - 25 - 49x^2 + 4 =

= 8x^2 + 82x + 3