(x+1)(2x-4) => 2x²-4x+2x-4 => 2x²-2x-4 => -4+2=-2 => (-4)·2=-8
(2x-1)(4x+1) => 8x²+2x-4x-1 => 8x^2-2x-1 => 2+(-4)=-2 => 2·(-4)=-8
(3x+1)(x+5) => 3x²+15x+x+5 => 3x²+16x+5 => 15+1=16 => 15·1=15
(4x-3)(2x-1) => 8x²-4x-6x+3 => 8x^2-10x+3 => -4+(-6)=-10 => (-4)·(-6)=24
Пошаговое объяснение:
1) (x+1)(2x-4)= 2x^2 -4x +2x -4
2) 2x^2 -2x -4
3)m +n = -4 +2= - 2
4) mn=ac ; -4*2 = 2* ( -4) ; -8= -8
2) 1) (2x-1)(4x +1) = 8x^2 + 2x -4x -1
2) 8x^2 -2x -1
3) m+n = 2+ ( -4) = - 2
4) mn = ac ; -4*2= 8* (-1) ; -8= -8
3) 1) (3x+1)(x+5) = 3x^2 +15x +x +5
2) 3x^2 +16x + 5
3) m+n= 15+1=16
4) mn= ac ; 15*1=3*5 ; 15=15
4) 1) (4x-3)(2x-1)= 8x^2 -4x -6x +3
2) 8x^2 -10x +3
3) m+n= -4-6 = -10
mn=ac ; -4 *( -6) = 8*3 ; 24=24
(x+1)(2x-4) => 2x²-4x+2x-4 => 2x²-2x-4 => -4+2=-2 => (-4)·2=-8
(2x-1)(4x+1) => 8x²+2x-4x-1 => 8x^2-2x-1 => 2+(-4)=-2 => 2·(-4)=-8
(3x+1)(x+5) => 3x²+15x+x+5 => 3x²+16x+5 => 15+1=16 => 15·1=15
(4x-3)(2x-1) => 8x²-4x-6x+3 => 8x^2-10x+3 => -4+(-6)=-10 => (-4)·(-6)=24
Пошаговое объяснение:
1) (x+1)(2x-4)= 2x^2 -4x +2x -4
2) 2x^2 -2x -4
3)m +n = -4 +2= - 2
4) mn=ac ; -4*2 = 2* ( -4) ; -8= -8
2) 1) (2x-1)(4x +1) = 8x^2 + 2x -4x -1
2) 8x^2 -2x -1
3) m+n = 2+ ( -4) = - 2
4) mn = ac ; -4*2= 8* (-1) ; -8= -8
3) 1) (3x+1)(x+5) = 3x^2 +15x +x +5
2) 3x^2 +16x + 5
3) m+n= 15+1=16
4) mn= ac ; 15*1=3*5 ; 15=15
4) 1) (4x-3)(2x-1)= 8x^2 -4x -6x +3
2) 8x^2 -10x +3
3) m+n= -4-6 = -10
mn=ac ; -4 *( -6) = 8*3 ; 24=24