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12 years ago
Solve the polynomial equation by factoring and then using the zero product principle.

3x^4=375x

Please help.  Thanks.
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wrote...
#1
12 years ago
3x^4-375x=0
3x(x^3- 125)=0
3x(x+5)(x+5)(x-5)=0
Set each of the x's to 0.
ex: 3x=0, x+5=0, etc.
wrote...
#2
12 years ago
The factorization is 3x(x-5)(x^2 + 5x + 25) = 0.  Now use the zero product principle.
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