Question

2х²-5х-7=0; зн суму коренів рівняння

Answer 1

D=81=9^2
X1=(5+9)/4=3,5
X2=(5-9)/4=-1
Sum=3,5-1=2,5

Answer 2

To find the sum of the roots of the quadratic equation $2x^2 - 5x - 7 = 0$, we can use the fact that the sum of the roots of a quadratic equation of the form $ax^2 + bx + c = 0$ is given by $-\frac{b}{a}$.

In this equation, $a = 2$ and $b = -5$. The sum of the roots, denoted by $S$, is:

$S = -\frac{b}{a} = -\frac{-5}{2} = \frac{5}{2}$

Therefore, the sum of the roots of the given equation is $\frac{5}{2}$.