Homework Help: Algebra

Posted by lee on Sunday, October 31, 2010 at 11:00pm.

Hello Reiny, please check these problems for me and if they are not right WOULD YOU PLEASE HELP ME WITH THE CORRECT ONES THANKS!!!
1. Slove for X, wher X is the real number, square root 5x + 9= square root 9x + 13= 27
2. Find the value: ^3 square root -27= 9
3. Write the following in simplified radical form ^4 square root 80= 4
PLEASE HELP QUICKLY!!

Algebra - Reiny, Sunday, October 31, 2010 at 11:08pm
1 . I assume you meant
√(5x+9) = √(9x+13)
if so, then square both sides
5x + 9 = 9x + 13
-4x = 4
x = -1, the answer checks in my equation

2. I can't figure out what you are saying.
are you finding the cuberoot of -27 ?
if so, the cuberoot of -27 = -3

3 again, is that supposed to the fourth root of 80 ?

80^(1/4) = (16)^(1/4) (5)^(1/4)
= 2 times cuberoot of 5
Algebra - Reiny, Sunday, October 31, 2010 at 11:10pm
last line should have said

2 times fourthroot of 5
Algebra - lee, Sunday, October 31, 2010 at 11:15pm
THANKS AGAIN Reiny!!

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