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Chapter 9: Q. 392 (page 1108)

For the equation u+42=u

(a) Is u=-6solution?

(b) Is u=7a solution?

Short Answer

Expert verified

The value u=-6is not a solution and u=7 is a solution

Step by step solution

01

Part (a) Step 1: Given information

Given equationu+42=u

02

Part (a) Step 2: Substituting and checking

Substituting, we get

-6+42=-636=-66=-6

Its not true and is not a solution

03

Part (b) Step 1: Given information

Given equationu+42=u

04

Part (b) Step 2: Substituting and checking

Substituting, we get

7+42=749=77=7

Its true so it is a solution

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