An operation that is done to a value and it stays the same, it is called the "identity property".
Some quick examples:
Adding any number with zero will result in the same number.
Multiplying any number with one will result in the same number.
Hope this helps!
By the quadratic formula,
Then
Multiply numerator and denominator by the denominator's conjugate:
Answer:
50 * 1.3 = 65
130% increase