wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

If A = 7x2 + 5xy − 9y2, B = −4x2 + xy + 5y2 and C = 4y2 − 3x2 − 6xy then show that A + B + C = 0.

Open in App
Solution

A = 7x2 + 5xy − 9y2
B = −4x2 + xy + 5y2
C = 4y2 − 3x2 − 6xy

Substituting the values of A, B and C in A+B+C:
= (7x2 + 5xy − 9y2)+(−4x2 + xy + 5y2)+(4y2 − 3x2 − 6xy)
= 7x2 + 5xy − 9y2−4x2 + xy + 5y2+4y2 − 3x2 − 6xy

Rearranging and collecting the like terms:
(7-4-3)x2 + (5+1-6)xy +(−9+5+4)y2
= (0)x2 + (0)xy + (0)y2
= 0
A+B+C=0

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
MATHEMATICS
Watch in App
Join BYJU'S Learning Program
CrossIcon