- How can i factor 25a^2 - b^2+4bd-4d^2?

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When you don't know an animal's gender, is it best to refer to the animal as "he", "she", "he/she", or "it"? Increasee the speed at which the axon conduct action potentials? Help with series please? In optical fibre how can the time difference of different dispersion can be reduced? Let P(x) be a polynomial of degree 5. If P(1)=0, P(3)=1, P(9)=2, P(27)=3 ,P(81)=4 and P(243)=5,what is the coefficient of x in P(x)?