Question

Resolva as equações biquadradas, considerando u=r

(x²-3)²=9​

Answer 1

(x²-3)²=9

(x²-3)=√9

(x²-3)= ±3 ↓

=> x²-3 = -3 => x²=0 => x= 0 ✓

=> x²-3 = +3 => x²=6 => x= ±√6 ✓