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NDA 2026
Exam
NDA
Year
2026
Subject
Mathematics
Chapter
Functions

NDA 2026 · Mathematics · Functions

Passage: Consider the curves y=x^2 and y=2|x| . Question: What is...

Passage: Consider the curves y=x2y=x^2 and y=2∣x∣y=2|x|.

Question: What is the number of points of intersection of the curves ?

Options

  1. A44
  2. B33
  3. C22
  4. DNone

Correct answer

B. 33

Step-by-step solution

Equating the two given curves y=x2y = x^2 and y=2∣x∣y = 2|x|:

x2=2∣x∣x^2 = 2|x|

Since x2=∣x∣2x^2 = |x|^2, the equation becomes:

∣x∣2−2∣x∣=0|x|^2 - 2|x| = 0

∣x∣(∣x∣−2)=0|x|(|x| - 2) = 0

This gives ∣x∣=0|x| = 0 or ∣x∣=2|x| = 2.

Solving for xx, we get x=0x = 0, x=2x = 2, and x=−2x = -2.

The corresponding points of intersection are (0,0)(0,0), (2,4)(2,4), and (−2,4)(-2,4).

The number of points of intersection is 33.

Answer: 33
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