Question

resolva a equação biquadrada
x⁴-x²-2=0

Answer 1

$\mathsf{\Delta=1+8=9}\\\mathsf{x^2=\dfrac{1\pm3}{2}}\\\mathsf{x^2=\dfrac{1+3}{2}=\dfrac{4}{2}=2}\\\large\boxed{\boxed{\boxed{\boxed{\mathsf{x=\pm\sqrt{2}}}}}}$