Answer:
Step-by-step explanation:
The simple short answer is because all real numbers are to be squared.
If any negative value is put into x^2, the value will become positive. That's because an even number of negatives are positive.
For example y = x * x
Let x = - 3
y = (-3)(-3)
y = 9 because there are an even number of negatives.
Notice that if break x^2 into x * x, you should see more clearly that each x is equal to - 3
