Join Sarthaks eConnect Today - Largest Online Education Community!
0 votes
16 views
asked in Mathematics by (10.4k points)

If 2l - 3m = -1 and lm = 20, then the value of 4l+ 9m is

commented by (10.4k points)
Dont forget to explain.

1 Answer

+1 vote
answered by (9.2k points)
selected by
 
Best answer
I think we are to find out

4l^2+9m^2

=[(2l)-(3m)]^2+4*2l*3m

=(-1)^2+24*20=481

Formula used

a^2+b^2=(a-b)^2+4ab

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.

One Thought Forever

“There is a close connection between getting up in the world and getting up in the morning.“
– Anon
~~~*****~~~

Categories

...