The given quadratic equation is

comparing with

We get ,

formula :

Discriminant of given quadratic equation is 25 .
option (B) 25 ✔
We divide the value by 1000 and multiply bit by the mills.
112000 / 1000 = 112 * 25 = 2800
145.98 is rounded to 146.00.
Hope this helps you! :)
Answer=42 degrees
Complementary angles= 90 degrees
90-48=42
If you're referring to the different sets of real numbers, it's the ones that you could try to do subtraction and not get an answer that still in that set.
For example, natural numbers (aka 1, 2, 3, 4, ...) are not, because 7 - 11 = -4 and -4 is not a natural number.
Also, whole numbers (aka 0, 1, 2, 3, 4, ...) has the same issue.
Basically any set of real numbers that doesn't include negative numbers will have this issue.