Question

2x²-5x-4=0
a)x¹×x²
b)x¹+x²
помогите ​

Answer 1

2x²-5x-4=0

a = 2

b = - 5

c = - 4

a)

$x_{1}\cdot x_{2}=\frac{c}{a}$

$x_{1}\cdot x_{2}=\frac{-4}{2}$

$x_{1}\cdot x_{2}=-2$

b)

$x_{1}+x_{2}=-\frac{b}{a}$

$x_{1}+x_{2}=-\frac{-5}{2}$

$x_{1}+x_{2}=2,5$