If 2x+3y=12 and xy=6 find 8x*x*x …
CBSE, JEE, NEET, CUET
Question Bank, Mock Tests, Exam Papers
NCERT Solutions, Sample Papers, Notes, Videos
Posted by Sahana Uppal 7 years, 10 months ago
- 1 answers
Related Questions
Posted by Savitha Savitha 11 months, 1 week ago
- 0 answers
Posted by Akhilesh Patidar 11 months ago
- 0 answers
Posted by Duruvan Sivan 3 weeks, 3 days ago
- 0 answers
Posted by Alvin Thomas 2 months, 1 week ago
- 0 answers
Posted by Yash Pandey 3 weeks, 3 days ago
- 0 answers
Posted by Sheikh Alfaz 1 week, 5 days ago
- 0 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Dharmendra Kumar 7 years, 10 months ago
8x3+27y3=23x3+33y3=(2x)3+(3y)3 [by using anbn=(ab)n]
Now by using identity
(a+b)3=a3+b3+3ab(a+b)
a3+b3=(a+b)3 - 3ab(a+b) ---------(1)
Now 8x3+27y3=(2x)3+(3y)3
= (2x+3y)3-3(2x)(3y)(2x+3y) [by using equation (1) put a=2x and b=3y]
= (2x+3y)3 - 18xy(2x+3y)
= (12)3 - 18×6×12 [given 2x+3y =12 and xy= 6]
=1728 -1296
= 432
4Thank You