3х^2(х-1)(х+1)-10х^2+4=0

Question

3х^2(х-1)(х+1)-10х^2+4=0

Answer 1

3x^4-3x²-10x²+4=0
x²=a
3a²-13a+4=0
D=169-48=121
a1=(13-11)/6=1/3⇒x²=1/3⇒x=-1/√3 U x=1/√3
a2=(13+11)/6=4⇒x²=4⇒x=-2 U x=2