Question 645579
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Hi,
Factor Polynomial Completely
{{{b^4-9b^2 = b^2(b^2-9) = b^2(b+3)(b-3) }}}
checking (b+3)(b-3) using FOIL
F	First terms  b^2
O	Outside terms -3b
I	Inside terms   3b
L	Last terms    -9