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PLEASE HELP ME WITH THIS FACTORING PROBLEM!?
a^4 - 625a^2 - 4096
A: (a - 5)(a + 5)(a - 8)(a + 8)
B: (a - 5)(a + 5)(a^2 + 64)
C: (a^2 + 25)(a - 8)(a + 8)
D: (a^2 + 25)(a^2 + 64)
E: Nonfactorable
1 Answer
- Anonymous1 decade agoFavorite Answer
The expression
a^4 - 625a^2 - 4096
is in 'quadratic' form. One could use u-substitution, but it is not necessary to evaluate the discriminant.
The discriminant of this expression is not a perfect square, so the expression can not be factored.
The answer is E.
QED