Use app×
QUIZARD
QUIZARD
JEE MAIN 2026 Crash Course
NEET 2026 Crash Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
4.5k views
in Mathematics by (50.3k points)
closed by

The number of distinct real roots of the equation \(|\mathrm{x}||\mathrm{x}+2|-5|\mathrm{x}+1|-1=0\) is ______.

1 Answer

+1 vote
by (50.1k points)
selected by
 
Best answer

Correct answer: 3

Number line

Case-1

\(x \geq 0\)

\(x^2+2 x-5 x-5-1=0\)

\(x^2-3 x-6=0\)

\( x=\frac{3 \pm \sqrt{9+24}}{2}=\frac{3 \pm \sqrt{33}}{2}\)

One positive root.

Case-2

\(-1 \leq x<0\)

\(-x^2-2 x-5 x-5-1=0\)

\( x^2+7 x+6=0\)

\((x+6)(x+1)=0\)

\(x=-1\)

One root in range.

Case-3

\(-2 \leq x<-1\)

\(x^2-2 x+5 x+5-1=0\)

\(x^2-3 x-4=0\)

\((x-4)(x+1)=0\)

No root in range.

Case-4

\(x < -2\)

\(x^2 + 7x + 4= 0\)

\(x = \frac{-7 \pm \sqrt{49 - 16}}2 = \frac{7 \pm \sqrt {33}}2\)

One root in range.

Total number of distinct roots are 3.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

...