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 Factor $$b^4-25b^2+144$$

 Jan 18, 2021
 #1
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b^4 - 25b^2 + 144

= (b-3)(b+3)(b-4)(b+4)

= ((b-3)^2)((b-4)^2)

 

so b = 3, -3, 4, or -4

 Jan 18, 2021

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