Question

Bài 1:Tìm giá trị của x để thõa mãn các đẳng thức sau:

a,2x(x-1)-x^2+6=0

b,x^4-2x^2(3+2x^2)+3x^2(x^2+1)=-3

c,(x+1)(x^2-x+1)-2x=x(x-2)(x+2)

d,(x+3)(x^2-3x+9)-x(x-2)(x+2)=15

giúp mk vs mk cần gấp

Answer 1

a) \(2x^2-2x-x^2+6=0\) 

\(\Leftrightarrow x^2-2x+1+5=0\)

\(\Leftrightarrow\left(x-1\right)^2=-5\) ( vô lý)

Vậy không có x thoả mãn \(2x.\left(x-1\right)-x^2+6=0\)

b) \(x^4-2x^2.\left(3+2x^2\right)+3x^2.\left(x^2+1\right)=-3\) 

\(\Leftrightarrow x^4-6x^2-4x^4+3x^4+3x^2+3=0\)

\(\Leftrightarrow3-3x^2=0\)

\(\Leftrightarrow3x^2=3\Leftrightarrow x^2=1\) \(\Leftrightarrow x\in\left\{-1;1\right\}\)

Vậy \(x\in\left\{-1;1\right\}\)

c) \(\left(x+1\right).\left(x^2-x+1\right)-2x=x.\left(x-2\right).\left(x+2\right)\)

\(\Leftrightarrow x^3+1-2x-x.\left(x^2-4\right)=0\)

\(\Leftrightarrow x^3+1-2x-x^3+4x=0\)

\(\Leftrightarrow1+2x=0\Leftrightarrow x=\dfrac{-1}{2}\)

Vậy x=\(\dfrac{-1}{2}\)

d) \(\left(x+3\right).\left(x^2-3x+9\right)-x.\left(x-2\right).\left(x+2\right)=15\)

\(\Leftrightarrow x^3+27-x.\left(x^2-4\right)-15=0\)

\(\Leftrightarrow x^3-27-x^3+4x-15=0\)

\(\Leftrightarrow4x-42=0\)

\(\Leftrightarrow x=10,5\)

Vậy x=10,5