Answer:
Conjugate radicals.
Step-by-step explanation:
The two roots a+sqrb and a-sqr b are called conjugate radicals.
Given the polynomial expression:
(y + 5)²
(y - 5)(y + 5)
Let's simplify each of the given expression:
a.) (y + 5)²
The given equation is a factor of a perfect square trinomial. For this type of expression, the following is the formula for expanding it.

We get,


b.) (y - 5)(y + 5)
To be able to simplify the following expression. We will be using the formula for the difference of two squares.

We get,

Perimeter of circular area = πr = 3.14 * 10 = 31.4 mm
Perimeter of rectangular area = 30 + 20 + 30 = 80 mm
Total Perimeter = 80 + 31.4 = 111.4
In short, Your Answer would be 111.4 mm
Hope this helps!
The answer is -28
(sorry if i get this wrong)