pt < => 4x^2 +8x + 4 + 4x^2 -4x + 1 -8 (x^2-1) = 11
<=> 8x^2 +4x +5 -8x^2 + 8 = 11 => 4x = 11-5 - 8 => 4x = -2 => -x= 1/2
Vậy x = -1/2 là ngiệm của pt
Tìm x
a) 4(x + 1)2 + (2x + 1)2 - 8(x – 1)(x + 1) - 11=0
b)(x + 3)2 – (x – 4)(x + 8) – 1 = 0
tìm x :
4 ( x + 1 ) mũ 2 + ( 2x - 1 ) mxu 2 - 8 ( x - 1 ) ( x - 1 ) = 11
tìm x
a,(3x^2-x+1)(x-1)+x^2(4-3x)=5/2
b,4(x+1)^2+(2x-1)^2-8(x-1)(x+1)=11
c,(2x-1)^2+(x+3)^2-5(x+7)(x-7)=0
Tìm x biết:
4.(x+1)^2+(2x-1)^2-8(x-1)(x+1)=11
Bài 4: Tìm x, biết:
a) 3(2x – 3) + 2(2 – x) = –3 ; b) x(5 – 2x) + 2x(x – 1) = 13 ;
c) 5x(x – 1) – (x + 2)(5x – 7) = 6 ; d) 3x(2x + 3) – (2x + 5)(3x – 2) = 8 ;
e) 2(5x – 8) – 3(4x – 5) = 4(3x – 4) + 11; f) 2x(6x – 2x 2 ) + 3x 2 (x – 4) = 8.
tìm x biết:
4(x+1)^2 +(2x-1)-8(x-1)(x+1)=11
Tìm x biết: 4(x+1)2+(2x-1)2-8(x-1)(x+1)=11
Tìm x biết : 4(x+1)2 + (2x-1)2 - 8(x-1)(x+1) = 11
tìm x biết : 4(x+1)2 + (2x -1)2 - 8(x-1)(x+1) = 11
