I did not understand the logic behind the plus minus signs in the ques

Maths

This question was asked in Ex 7.11, 5

I did not understand the logic behind the plus minus signs in the question no. 5 of Ncert class 12 maths chapter 7 exercise 7.11

Saipriya Shastri

Dec. 15, 2018, 2:04 p.m.

Class 6