1) I3x²+7xI = 4
3x² + 7x = 4
3x² + 7x= -4
x =
x = -1
x =
x₁ = , x₂ =
2. x² - 5 * IxI + 4 = 0
x² - 5x + 4 = 0, x≥0
x² - 5 * (-x) + 4 = 0, x<0</p>
x=4, x≥0
x = 1, x≥0
x = -1, x<0</p>
x = -4, x<0</p>
x = 1
x = 4
x = -4
x = -1
x₁ = -4, x₂ = -1, x₃ = 1, x₄ = 4