Решите уравнение (х^2-16)^2+(х^2+х-12)^2=0

(х^2-16)^2+(х^2+х-12)^2=0
x^4-256+x^4+x^2-144=0
x^4+x^4+x^2=256+144
2x^4+x^2=400
x^2(2x^2+1)=400
x^2=400
x=20
2x^2+1=400
2x^2=399
x^2=399/2
x^2=199.5
x=√199.5