Question

Aceste exercitii,va rog

Answer 1

Răspuns:

Explicație pas cu pas:

30.

(x + 1)^2 + (3x - 1)^2 = (x - 3)^2 + (3x + 4)^2

x^2 + 2x + 1 + 9x^2 - 6x + 1 = x^2 - 6x + 9 + 9x^2 + 24x + 16

10x^2 - 4x + 2 = 10x^2 + 18x + 25

18x + 4x = 2 - 25

22x = -23

x = -23/22

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31.

Produsul mezilor = Produsul extremilor

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

6x^2 + 5x - 12x - 10 = 6x^2 + 3x - 4x -2

6x^2 - 7x - 10 = 6x^2 - x - 2

7x - x = 2 - 10

6x = -8

x = -8/6 = -4/3