Answer:
In the pic
Step-by-step explanation:
If you have any questions about the way I solved it, don't hesitate to ask me in the comments below ÷)
The given quadratic equation is

comparing with

We get ,

formula :

Discriminant of given quadratic equation is 25 .
option (B) 25 ✔
Hi Robles928518,
0,1x + 9 ≤ 45
0,1x ≤ 45 - 9
0,1x ≤ 36
x ≤ 360
x ∈ ] - ∞ ; 360 ]
A. 2x3=6 and 6x12=72 so 78 is greater than 36
6+72=79 which is less than 90