SOLUTION: Please help me with this equation: 7= -12/x - 1/x^2

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Question 621731: Please help me with this equation: 7= -12/x - 1/x^2
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

Using Common Denominator..

7+=+-12%2Fx+-+1%2Fx%5E2   |||Multiplying thru by x^2 so as all denominators = 1

  7x^2 = -12x - 1

 7x^2 + 12x + 1 = 0

x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+

x+=+%28-12+%2B-+sqrt%28+144-28+%29%29%2F%2814%29+ 

x+=+%28-12+%2B-+sqrt%28+116%29%29%2F%2814%29+ 

x+=+%28-12+%2B-+sqrt%28+4%2A29%29%29%2F%2814%29+

x+=+%28-12+%2B-+2sqrt%28+29%29%29%2F%2814%29+ 

  x = -0.0878 or x =  -1.6265