Question

Будь ласка допоможіть

Answer 1

1.

${x}^{2} - 169 = 0 \\ {x}^{2} = 169 \\ x = + - \sqrt{169} \\ x = + - 13$

2.

$2x(x + 3) = 6x \\ 2 {x}^{2} + 6x - 6x = 0 \\ 2 {x}^{2} = 0 \\ {x}^{2} = 0 \\ x = 0$

3.

$4 {x}^{2} - 2x = x( x - 2) \\ 4 {x}^{2} - 2x = {x}^{2} - 2x \\ 4 {x}^{2} - 2x - {x}^{2} + 2x = 0 \\ 3 {x}^{2} = 0 \\ {x}^{2} = 0 \\ x = 0$

4.

$(7x - 2)(x + 1) = 5(x + 4) - 1 \\ 7 {x}^{2} + 7x - 2x - 2 = 5x + 20 - 1 \\ 7 {x}^{2} + 7x - 2x - 5x = 20 - 1 + 2 \\ 7 {x}^{2} = 21 \\ {x}^{2} = 3 \\ x = + - \sqrt{3}$

5. $\frac{a - 2}{4} = - \frac{1}{a + 2} \\ (a - 2)(a + 2) = - 4 \\ {a}^{2} - 4 = - 4 \\ {a}^{2} = 0 \\ a = 0$