Question

Vă rog ajutați-mă, este urgent, dau coroană​

Answer 1

Răspuns:

Explicație pas cu pas:

V. 1. 7x + 3(2x + 1) = 10x + 9 =>7x + 6x + 3 = 10x + 9 => 13x + 3 = 10x + 9 => 13x - 10x = 9 - 3 => 3x = 6 | :3 => x = 2  

   2. 2(x - 3) - 13 = x - 21 => 2x - 6 - 13 = x -21 => 2x - 19 = x - 21 => 2x - x = -21 + 19 => x = -2

   3. 5(2x + 3) - 6(x + 2) = 2x + 7 => 10x + 15 - 6x - 12 = 2x + 7 => 4x + 3 = 2x + 7 => 4x - 2x = 7 - 3 => 2x = 4 | :2 => x = 2

VI. 1. 4(x + 5) - 3 (x - 3) = 2 - 3(x + 15) => 4x + 20 - 3x + 9 = 2 - 3x - 45 => x +29 = -3x - 43 => x + 3x = -43 - 29 => 4x = -72 | :4 => x = -18

    2. 5(x + 2) - 4(x - 2) = 3(x + 8) => 5x + 10 - 4x + 8 = 3x + 11 => x + 18 = 3x + 11 => 18 - 11 = 3x - x => 7 = 2x => x =  $\frac{7}{2}$

    6. $(x + 1)^{2}$ = x(x + 3) - 5 => $x^{2}$ + 2x + 1 = $x^{2}$ + 3x - 5 => $x^{2}$ - $x^{2}$ + 1 + 5 = 3x - 2x => 6 = x

    7. 3(2x - 7) - 5(3x + 1) + 4x = 8 - 2(5x - 3) => 6x - 21 - 15x - 5 + 4x = 8 - 10x + 6 => -5x - 26 = 14 - 10x => - 5x + 10x = 14 + 26 => 5x = 40 | :5 => x = 8  

Sper sa fie corect .