Soru
53. How many integers in the inequality vert x^2-xvert gt 2x Does it not apply? E) 6 A) 2 B) 3 C) 4 (D)
Çözüm
4.3
(281 Oylar)
Levent
Elit · 8 yıl öğretmeni
Uzman doğrulaması
Cevap
To solve the inequality
, we need to consider two cases based on the absolute value expression.**Case 1:**
This simplifies to:
Factor the quadratic:
The critical points are
and
. We test intervals around these points:- For
- For
, choose
: \(4(4 - 3) = 4 > 0\)Thus, the solution for this case is \(x \in (-\infty, 0) \cup (3, \infty)\).**Case 2:** \(-(x^2 - x) > 2x\) or equivalently
- For
- For
, choose
: \(1(1 + 1) = 2 > 0\)Thus, the solution for this case is \(x \in (-1, 0)\).Combining both cases, the solution to the inequality
is:
Now, we find the integers that do not satisfy this inequality. These integers are in the intervals where the inequality does not hold, which are:
The integers in these intervals are:
.Therefore, there are 3 integers where the inequality does not apply. The answer is:B) 3