Question

(2y+5) (2y-5)Use the suitable identity​

Answer 1

Answer:

a^-b^

Step-by-step explanation:

the answer is 4y^-25

Answer 2

Answer:

4y²-25

Step-by-step explanation:

let z=(2y+5) (2y-5)

Let a=2x and 5=b

so z=(a+b)(a-b)=a²-b²

=(2y)²-5²

=4y²-25