Question

Решите срочноооо пожалуйста, с обьяснениями

Answer 1

Объяснение:

1)

${x}^{2} - 16 - ( {x}^{2} - 25) = 6x + 18 \\ 9x = 6x + 18 \\ - 6x = 18 - 9 \\ - 6x = 9 \\ x = - \frac{3}{2}$

2)

${x}^{2} - 4 - ( {x}^{2} - 9) = 12 + 4x \\ 5 = 12 + 4x \\ - 4x = 12 - 5 \\ x = - \frac{7}{4}$

3)

$(4 - 2x) ^{2} = 4{x}^{2} + 20 - 10x \\ 16 - 16x + 4 {x}^{2} + 20 - 10x \\ 16 - 16x = 20 - 10x \\ - 16x + 10x = 20 - 16 \\ - 6x = 4 \\ x = - \frac{2}{3}$

4)

$(1 + 3x) ^{2} = 10x - 4 - 9 {x}^{2} \\ 1 + 6x + 9 {x}^{2} = 10x - 4 + 9 {x}^{2} \\ 1 + 6x = 10x - 4 \\ 6x - 10x = - 4 - 1 \\ x = \frac{5}{4}$

5)

$8x - 16 = 4x + 12 \\ 8x - 4x = 12 + 16 \\ 4x = 28 \\ x = 7$