Question

помогите пожалуйста сейчас срочно нужно умоляю!! ​

Answer 1

Ответ:

$49 {x}^{2} - (7x + 1) {}^{2} = 27 \\ 49 {x}^{2} - (49 {x}^{2} + 14x + 1) = 27 \\ 49 {x}^{2} - 49x {}^{2} - 14x - 1 = 27 \\ - 14x - 1 = 27 \\ - 14x = 27 + 1 \\ - 14x = 28 \\ x = - 2$

$(5x + 1) {}^{2} - (5x - 1) {}^{2} = 11x - 3 \\ 2 \times 10x = 11x - 3 \\ 20x = 11x - 3 \\ 9x = - 3 \\ x = - \frac{1}{3}$

Answer 2

Объяснение:

1) 49x²-(7x+1)²=27

49x²-49x²-14x-1=27

-14x=27+1

-14x=28

x=28÷(-14)

x=-2

2) (5x+1)²-(5x-1)²=11x-3

25x²+10x+1-25x²+10x-1=11x-3

20x=11x-3

20x-11x=-3

9x=-3

x=-3÷9

x= -1/3