Question

\(CMR:x^4+4x^2+2014\) vô nghiệm

 

Answer 1

\(x^4+4x^2+2014=\left(x^2+2\right)+2000>0\)

=> PT vô nghiệm

Answer 2

Ta có : x⁴ \(\ge\)0  ;      4x² \(\ge\)0 ; 2014 > 0

=> x⁴ + 4x² + 2014 > 0

=> x⁴ + 4x² + 2014 vô nghiệm

Answer 3

\(\left(\left(x^2\right)^2+2x.2+4\right)+2010\)

\(\left(x^2+2\right)^2+2010\ge2010>0\)

Vậy...