-2Step-by-step explanation:
Given a quadratic equation

1. the first thing we do when we want to compete the square, is write the coefficient of x as 2 times a number.
In our case the coefficient of x is 10, so we write 10 as 2*5
2. then we write +

and -

to the expression:



Answer:
Because there nobody that teaches them how to do math
Whole number can be a integer. rational number can not be a integer that is repeating.