Answer:
(5y - 1)(5y + 1)
Step-by-step explanation:
Assuming you require the expression to be factorised.
25y² - 1 ← is a difference of squares and factors in general as
a² - b² = (a - b)(a + b) , then
25y² - 1
= (5y)² - 1²
= (5y - 1)(5y + 1)
Below.
25y²-1
This is the difference of 2 squares and it factors to (5y - 1)(5y + 1).
