Question

Помогите срочно!!!!!

Answer 1

1) x₁ = 3   x₂ = 7

x² + bx + c = 0

- b = x₁ + x₂ = 3 + 7 = 10

b = - 10

c = x₁ * x₂ = 3 * 7 = 21

x² - 10x + 21 = 0

2) x² - 7x + 12 = 0

x₁ + x₂ = 7

x₁ *x₂ = 12

x₁ = 3     x₂ = 4

$3)2x^{2}+15x+13=0\\\\x_{1}+x_{2}=-\frac{15}{2}=-7,5\\\\x_{1}*x_{2}=\frac{13}{2}=6,5\\\\x_{1}=-1\\\\x_{2}=-6,5\\\\\boxed{2x^{2}+15x+13=2(x+1)(x+6,5)}$