решить
9x⁴-13x²+4=0
(x²-8)²+3(x²-8)=4

Объяснение:

9t² - 13t + 4 = 0

t = 4/9 = x²

t = 1 = x²

x₁ = 1, x₂ = -1, x₃ = 2/3, x₄ = - 2/3

t² + 3t - 4 = 0

t = - 4

t = 1

x² = 4

x² = 9

x₁ = 2, x₂ = -2, x₃ = 3, x₄ = -3

1 сарай 3х-2,

2 сарай х+2,

х+2=5/7(3х-2),

1 1/7х=3 3/7,

х=3,

1 сарай 3х-2=3*3-2=7 т,

2 сарай х+2=3+2=5т,

b1=8

q=1.2

b2=8*1.2=9.6

b3=9.6*1.2=11.52

b4=11.52*1.2=13.824

b5=13.824*1.2=16.5888

s5=b5*q-b1/q-1

s5=16.5888*1.2-8/1.2-1=59.5328