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
6.3k views
in Algebraic Expressions by (64.6k points)

Subtract the sum of 3l – 4m – 7n2 and 2l + 3m – 4n2 from the sum of 9l + 2m – 3n2 and -3l + m + 4n2….

1 Answer

+1 vote
by (64.6k points)
selected by
 
Best answer

Sum of 3l – 4m – 7n2 and 2l + 5m – 4n2

= 3l – 4m – 7n2 + 2l + 3m – 4n2

= 3l + 2l – 4m + 3m – 7n2 – 4n2

= 5l – m – 11n2 ……………………..equation (1)

Sum of 9l + 2m – 3n2 and -3l + m + 4n2

= 9l + 2m – 3n2 + (-3l + m + 4n2)

= 9l – 3l + 2m + m – 3n2 + 4n2

= 6l + 3m + n2 ……………………….equation (2)

Let us subtract equation (i) from (ii), we get

= 6l + 3m + n2 – (5l – m – 11n2)

= 6l – 5l + 3m + m + n2 + 11n2

= l + 4m + 12n2

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.

...