Question

please give me a answer​

Answer 1

Answer:

I don't know the answer of this question

Answer 2

Step-by-step explanation:

hey mater here is your answer

we know a formula that :a^2-b^2=(a+b) (a-b)

1)=(x^2-y^2) (x^2+y^2)

=x^4-y^4

2)=(x+2) (x-2)

=x^2-4

3)=(2/b-5/c) (2/b+5/c)

=4/b^2-25/c^2

4)=(ab+9) (ab-9)

=a^2b^2-81

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