factorise using identity a2-b2=(a+b)(a-b) : 81- p^4
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Hi there
81 -p^4
(9)^2 -(p^2)2
⇒(9+p^2)(9-p^2)
81 -p^4
(9)^2 -(p^2)2
⇒(9+p^2)(9-p^2)
maxchristiano233:
i think you are wrong
Nope
i have done those problems in test too I got 10/10
uding identity
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