Объяснение:
1) 3 - 21x = 24x² ;
24x² + 21x - 3 = 0 ; │: 3
8x² + 7x - 1 = 0 ;
D = 7² - 4*8*( - 1 ) = 81 > 0 ; x₁ = ( - 7 - 9 )/2*8 = - 1 ; x₂ = ( -7 + 9 )/2*8 = 1/8 .
В - дь : - 1 ; 1/8 .
2) 32x² + 9x = - 36x ;
32x² + 9x + 36x = 0 ;
32x² + 45x = 0 ;
x* ( 32x + 45 ) = 0 ;
x₁ = 0 ; 32x + 45 = 0 ;
32x = - 45 ;
x = - 45/32 ;
x = - 1 13/32 . В - дь : - 1 13/32 ; 0 .
3) 9 = 48x² + 6x ;
48x² + 6x - 9 = 0 ; │ : 3
16x² + 2x - 3 = 0 ;
D = 196 > 0 ; x₁= - 1/2 ; x₂= 3/8 .
В - дь : - 1/2 ; 3/8 .
√х=6
х=36