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  • 23-11-2016
  • Mathematics
contestada

Find the exact value of the radical expression in simplest form.
2 the square root of 7 times x + the square root of 7 times x - 3 the square root of 7 times x - 7

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Greenleafable
Greenleafable Greenleafable
  • 06-12-2016
Here's the expression based on your question:

2√7x + √7x - 3√7x - 7 =
3√7x - 3√7x - 7 =
0-7 = 
-7

The correct answer is -7. You can easily subtract 2√7x, √7x, and 3√7x because they all have √7x in common, so it's basically the same as subtracting simple numbers 2, 1, and 3. 
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