Question

решите уравнение (х-7)^ 2-11=(х-2)(х+2)

Answer 1

( x - 7)² - 11 = ( x - 2)(x + 2)
x² - 14x + 49 - 11 = x² - 4
x² - x² - 14x = - 4 - 38
- 14x = - 42
14x = 42
x =42/14
x= 3