p9eh8andeitsjohnny p9eh8andeitsjohnny

10-06-2016
Mathematics

contestada

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

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HomertheGenius HomertheGenius

18-06-2016

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

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