Wednesday

October 22, 2014

October 22, 2014

Posted by **Sarah** on Saturday, January 8, 2011 at 4:48pm.

answers would be x>=16

x>=7/2

7/2<=x<=16

x<=16

I don't get this concept at all and I have 20 of these kinds of problems for homeowrk-can someone direct me how to start or give me an example or just help please? I really need to figure out this concept

Thank you

- Algebra-I really need help, please? -
**Reiny**, Saturday, January 8, 2011 at 5:04pm√(2x-7) > 5

Since both left and right side are positive we don't have to worry about any changes in direction of the inequality sign.

So square both sides

2x-7 ≥ 25

2x ≥ 32

x ≥ 16

and of course for √(2x-7) to be a real number, the inside must be ≥ 0

that is, 2x-7 ≥ 0

2x ≥ 7

x ≥ 7/2

so now you have x ≥ 7/2 AND x ≥ 16

which set of numbers satisfies BOTH conditions?

It would be x ≥ 16

(take x = 5 for an example

it satisfies the first condition, in that it is ≥ 7/2

but does not work for the original inequation. )

- Algebra-I really need help, please? -
**Sarah**, Saturday, January 8, 2011 at 5:07pmThank you for the detailed example-I can really use those to figure out the rest of my homeowrk-I should be good now

Thanks again

- Algebra-I really need help, please? -
**Reiny**, Saturday, January 8, 2011 at 5:09pmwelcome, come back if you run into more problems.

- Algebra-I really need help, please? -
**helper**, Saturday, January 8, 2011 at 5:11pmsqrt(2x-7) >= 5

What don't you understand?

to solve, square both sides to get rid of the radical

2x - 7 >= 25

2x >= 32

x >= 16

**Answer this Question**

**Related Questions**

Algebra-Please check - 1. solve sqrt (11-x) = sqrt(x-7) choices are 6,7,8 or9 I ...

some algebra help (radicals) - I hope I am writing this down right.. I am trying...

Algebra - I have a question if someone could help, please explain it. Given b...

college algebra--I really need help!! - solve the following exponential equation...

Algebra-drwls please check! - Posted by Megan on Tuesday, October 12, 2010 at 3:...

algebra,math,help - Use Property 2 to simplify each of the following radical ...

Geometry :( - this maths problem is wrecking my head.... 1.find the points of ...

Algebra-Please check - Please check- sqrt of 2x + 15 = x Answers: -5.3 -3.5 -3 5...

algebra - Can someone please help me with this one? Solve (5x+4)^1/2-3x=0 Just ...

Pre-Calc-Please check my answer-I think I have it - Could someone please check ...