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by Anonymous on November 10th, 2009
3X^2-7= -31, 3X^2= -24, X^2= -24/3, X^2= -8, X= SQR -8, which is not a rational number.
by Inactive member. on November 9th, 2009
3x^2 - 7 = -31
3x^2 = -31 +7
3x^2 = -24
x^2 = -24/3
x^2 = -8
There is no solution, except when using imaginary numbers. In which case, you could say...
x = sqrt of -8
or
x = sqrt of 8i
or
x = sqrt of 4*2*i which equals 2 sqrt of 2i
by iwnit on November 10th, 2009
1) No, because the equation is about x, not about X.
2) Assuming a typo:
3x^2-7=-31
3x^2=7-31=-24
x^2=-8
There are no real solutions. There are imaginary ones, though.
Further information:
http://en.wikipedia.org/wiki/Quadratic_equation
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by Anonymous on September 27th, 2011
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You're reading Can you solve this problem for X and show the work? 3x^2-7=-31 (Negative 31 and 3x is raised to the second power)
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Comments
Major Tom, why are you doing some kid's maths homework for him?
by Daniel on November 10th, 2009
It keeps my mind busy and away from killing myself.
by Anonymous on November 10th, 2009
Yikes. Let me know if I can feed you some more maths problems. ;-)
by Daniel on November 10th, 2009