(2x-1)2-(2x+3).(2x-3)=0
<=>4x2-4x+1-(4x2-9)=0
<=>4x2-4x+1-4x2-9=0
<=>-4x-8=0
<=>-4x=8
<=>x=-2
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(2x-1)2-(2x+3).(2x-3)=0
<=>4x2-4x+1-(4x2-9)=0
<=>4x2-4x+1-4x2-9=0
<=>-4x-8=0
<=>-4x=8
<=>x=-2
Tim x biet
\(x^4-2x^3-2x^2+3x+2=0\)
Tim x biet: x+\(2\sqrt{2x^2}\) +2x3=0
tim x biet x2-11x+18=0
-4x2+5x-1=0 2x3+3x2+2x+3=0x(2x-7)-4x+14=0tinh nhanh bt sau
A=3.(x-3).(x+7)+(x-4)2+48,tai x=0.5
Tim x;biet:
(2x-3)2-(2x+1)2=-3
tim x biet:
x+x2-x3-x4=0
2x3+3x2+2x2+3=0
x2-x-12=0
tim x biet
a) 9x^2+6x+1=0
b) 25x^2=4
c) 8-125x^3=0
d) (2x+1)-10(2x+1)(x+2)+25(x+2)^2=0
GIÚP MIK VS NHÉ
tim x biet
(5x-7) (x-9)-(-x+3)(-5x+2)=2x(x-4)-(x-1)(2x+3)
Tim x biet:
a) 5x2 . ( 2x - 3 ) + ( 2x2 + 3x + 3 ) . ( 3 - 2x ) = 6x3 - 9x2
b) ( 4x2 + 2x ) . ( x2 - x ) + ( 4x2 + 6 ) . ( x - x2 ) = 0
tim x biet:
(2x-3)2 - (x+5)2=0