Question

Factorise. y2-4. pls do it ​

Answer 1

Step-by-step explanation:

y2-4

y ² - 4 = 0

y² - ( 2 ) ² = 0

( y - 2) ( y + 2) = 0

( y - 2 ) = 0 or ( y + 2) = 0

y - 2 = 0 or y + 2 =0

y = 2 or y = -2