Question

(2 x - 5) ×( x + 6) =0​

Answer 1

(2 x - 5)( x + 6) =0​

(2 x - 5)=0

2х=5

$x_{1}$=2,5

( x + 6) =0

​$x_{2}$= - 6

Ответ: $x_{1}$=2,5  $x_{2}$= - 6

Answer 2

Ответ:

(2х-5)×(х+6)=0

2х^2+12х-5х-30=0

2х^2+7х-30=0

D=b^2-4ac

D=49+240=289=17^2

$x_{1} = \frac{ - 7 + 17}{2 \times 2} = \frac{10}{4} = 2.5$

$x_{2} = \frac{ - 7 - 17}{2 \times 2} = \frac{ - 24}{4} = - 6$