Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
1.7k views
in Quadratic Equations by (31.2k points)
closed by

If a and b are roots of the equation x2 + a x + b = 0, then a + b = 

A.

B.

C. – 2 

D. – 1

1 Answer

+1 vote
by (30.8k points)
selected by
 
Best answer

Given a and b are roots of the equation x2 + a x + b = 0 

Here a = 1, b = a, c = b 

Sum of the roots = a + b = – a/1 

b = – 2a 

Product of the roots 

ab = b 

a = 1 

∴ b = – 2 x 1 = – 2 

Now a + b = 1 + (– 2) = – 1

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.

...