Question

como resolve a equação biquadrada: x⁴-2x²=0

Answer 1

$x^{4} -2 x^{2} =0\to x^{2} =y\\ \\y^{2} -2y=0\\\\\\y(y-2)=0\\\\\\y=0\\\\\\y-2=0\to y=2\\\\\\\\S=(0,2)$

Answer 2

X²-2x²=0

X(x-2)=0
X=0 ou x-2=0
X=2

S={0,2}