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p9eh8andeitsjohnny
p9eh8andeitsjohnny p9eh8andeitsjohnny
  • 09-06-2016
  • Mathematics
Answered

If 5x + x² > 100, then x is not 10 8 7 9

Verified Answer :

HomertheGenius
HomertheGenius HomertheGenius
  • 18-06-2016

We will solve the equation:
x^2+5x-100≥0 \(x_{12} = \frac{-5\pm \sqrt{25+400} }{2}= \frac{-5\pm20.6}{2}\)      x1≈-12.8   x2≈ 7.8
It means that x∈ (-∞, -12.8 ) ∪ (7.8, +∞ ).
Answer: C) x ≠ 7
Thank you.

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