SOLUTION: Hello out there.
Can someone help me and my son solve this equation? They are asking for the "real solutions" to {{{x^3-13x=12}}}.
Please and much thanks. It's been a long
Algebra ->
Polynomials-and-rational-expressions
-> SOLUTION: Hello out there.
Can someone help me and my son solve this equation? They are asking for the "real solutions" to {{{x^3-13x=12}}}.
Please and much thanks. It's been a long
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Question 119560: Hello out there.
Can someone help me and my son solve this equation? They are asking for the "real solutions" to .
Please and much thanks. It's been a long time since I had to remember this stuff :-) Answer by scott8148(6628) (Show Source):
You can put this solution on YOUR website! subtracting 12 gives x^3-13x-12=0 __ substituting -1 for x satisfies the equation, so x+1 is a factor
dividing x^3-13x-12 by x+1 gives x^2-x-12, which factors into (x-4) and (x+3)
so x^3-13x-12=0 factors into (x+1)(x+3)(x-4)=0
setting each of the factors equal to zero, gives the "real" values of x __ -1, -3, 4
