Homework Help: Algebra-Please check

Posted by JoniAnne on Wednesday, October 20, 2010 at 11:50am.

Please check-

Solve 3 > sqrt(3x)
3x >=o
x>=o/3
x>=0

square both sides and you have 3x < 3^2
3x,9
x<9/3
x<3

answer is 0<=x<3 correct or not?

3(cube) sqrt(2-5) = 3
cube both sides = 2-5x = 27
-5x = 25
x = -5, correct?

Thank you

Algebra-Please check - Henry, Friday, October 22, 2010 at 7:14pm
1. Correct.

2. 3^3*sqrt(2 - 5x) = 3,
27*sqrt(2 - 5x) = 3,
Divide both sides by 27:
sqrt(2 - 5x) = 3/27 = 1/9,
Square both sides and get:
2 - 5x = 1/81,
-5x = 1/81 - 2,
-5x = 1/81 - 162/81,
-5x = -161/81,
Multiply both sides by -1/5:

x = (-161 / 81) * (-1/5) = 161 / 405.

CHECK:

3^3*sqrt(2 - (5*161/405)) =
27*sqrt(2 - 1.9877) =
27*sqrt(0.01235) =

27 * 0.11111 = 3.

Answer this Question

Related Questions

Algebra-Please check-I'm desperate - Posted by JoniAnne on Wednesday, ...
Algebra-Please check my work - Posted by JoniAnne on Wednesday, October 20, 2010...
algebra - Solve for x. (l is the absoulte bar, not one) 3*l 3x-2 l -6 > l...
math - solve for X ? 1) 8-3x < 14 -3x/-3 < 6/-3 x=-2 2) 7x -3 &...
Algebra - Please Solve: (x+3)(x-5) < 0 I got so far on this and am lost...
Math - help with these questions~ Thank you 1. Determine the interval(s) on ...
Precalculus - 1. Determine the interval(s) on which x^2 + 2x -3>0 a)x&...
Precalculus - Help with these questions help with these questions~ Thank you 1. ...
Algebra-Please check - 1. solve sqrt (11-x) = sqrt(x-7) choices are 6,7,8 or9 I ...
math - |(x-3)/(x+5)|< 2 i've asked so many ppl, but they all give me ...

For Further Reading

First Name:
School Subject:
Answer: