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Chapter 2: Q60. (page 93)

Evaluate the expression when x=4鈥�鈥�and鈥�鈥�y=-7. (Lesson 1.4)

y+-y

Short Answer

Expert verified

Value of expression y+-y=14.

Step by step solution

01

Step-1-Using mod operator concept

Recall that,

x=x if x>0, and,

x=-xif x<0.

02

Step-2-Solving given expression

Given y=-7which is less than0

Using above formula, we get

|y|=|-7||y|=-(-7)|y|=7

-y=-(-7)-y=7

-y greater than 0.

03

Step-3-Conclusion

Using above formula, we get

|-y|=|7||-y|=7

On substituting values in y+-y, we get

|y|+|-y|=7+7|y|+|-y|=14

Therefore, the value of expression y+-y=14.

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