(X+19)(x-3)-(2x-1)(2x+1)=x-38

Question

(X+19)(x-3)-(2x-1)(2x+1)=x-38

Answer 1

( x + 19 )( x - 3 ) - ( 2x - 1 )( 2x + 1 ) = x - 38 
x² - 3x + 19x - 57 - ( 4x² - 1 ) = x - 38 
x² + 16x - 57 - 4x² + 1 = x - 38 
- 3x² + 16x - 56 = x - 38 
3x² - 15x + 18 = 0 
D = 225 - 216 = 9 = 3²
x1 = ( 15 + 3 ) : 6 = 3 
x2 = ( 15 - 3 ) : 6 = 2 
Ответ 2 ; 3