## Hally Group Title Solve the equation. Identify any extraneous solutions. sqrt a = -8 A. –64 is a solution of the original equation. 64 is an extraneous solution. B. 64 is a solution of the original equation. C. 64 is a solution of the original equation. –64 is an extraneous solution. D. no solution <<< one year ago one year ago

1. tyteen4a03

To get rid of square roots, square both sides.

2. precal

|dw:1359074224200:dw|do just like tyteen4a03 suggested

3. Hally

a=64?

4. Hally

so, is it b or c??

5. Hally

i say c. am i right??

6. tyteen4a03

@Hally The answer is B. Whenever you are raising a number to an even number, the negative sign disappears. (If you need proof just ask.)

7. Hally

i know that part thanks! :)

8. precal

|dw:1359074648834:dw|

9. precal

|dw:1359074661681:dw|question is, is this true?

10. Hally

no. sqrt 64 = 8 and 8 is not equal to -8

11. precal

|dw:1359074893672:dw|

12. precal

then that means that the solution is extraneous

13. Hally

oh. so the answer is "64 is a solution of the original equation. –64 is an extraneous solution" .... right?