Question

Розвяжіть рівняння 7x - 2x2 - (10 - 2x2) = 11​

Answer 1

7x - 2x² - (10 - 2x²) = 11​

7х -2x² - 10 + 2x² = 11

7x - 10 = 11

7x = 11+10

7x = 21

x = 3

Answer 2

Ответ:

$7x - 2x2 - (10 - 2x2) = 11 \\ 7x - 4x - (10 - 2x \times 2) = 11 \\ 7x - 4x - (10 - 4x) = 11 \\ 7x - 4x - 10 + 4x = 11 \\ 7x - 10 = 10 \\ 7x = 21 \\ x = 3$