Question

7 и 8 задание пожалуйста

Answer 1

1)

x² + 5x - 9 = 0

x₁ * x₂ = - 9

x₁ + x₂ = - 5

x₁²x₂ + x₁x₂² = x₁x₂ * (x₁ + x₂) = - 9 * (- 5) = 45

2)

4x² - 9x - 1 = 0

$x_{1}*x_{2}=-frac{1}{4}=-0,25\\x_{1}+x_{2}=frac{9}{4}=2,25\\x_{1} ^{2}+x_{2} ^{2}=(x_{1}+x_{2})^{2}-2x_{1}x_{2}=(2,25)^{2}-2*(-0,25)=5,0625+0,5=5,5625$