Question

решить уравнение;16x^4-40x^2+25-10(4x^2-5)-11=0

Answer 1

16x^4-40x^2+25-10(4x^2-5)-11=0
16x^4-40x^2+25-40x^2+50-11=0
16x^4-80x^2+64=0  |:16
x^4-5x^2+4=0
x^2=t
t^2-5t+4=0
t1*t2=4
t1+t2=5
t1=4
t2=1
x^2=4          x^2=1
x1,2=+-2      x3,4=+-1