# College Algebra

posted by .

x^3-5x^2+4x-20 > 0 interval notation

• College Algebra -

factor by grouping
x^2(x-5) + 4(x-5) > 0
(x-5)(x^2+ 4) > 0

x^2 + 4 is always positive, so for the whole thing to be positive
x-5 > 0
x > 5

express it in the form you were taught.

## Similar Questions

1. ### algebra

i forgot to post these! f(x)=9x+4 and listed in interval notation also: f(x) x2+14x+40 in interval notation and: 1/x^2+81 (interval notation) and: x+11/x^2-121 (interval notation) and: f(x+2) f(x)=6x^2-x+7 You have listed a lot of …
2. ### Algebra

Solve and express in interval notation Solve: |5 – 8x| > 11 and write interval notation for the solution set. This is what I get but I need it in interval notation. x<-3/4 or x >2 Solve: (x-3)/(x^2-25)<0 and write interval …

Please show me how to put this in interval notation. Thanks! I know I solved this right, I think, but need to put it in interval notatioin. Please tell me if i am correct. Thanks! PleaseSolve: (x-3)/(x^2-25)<0 and write solution …
4. ### College algebra

use interval notation to express the solution set of the inequality |2x + 3|> or equal to 9
5. ### college algebra

solve the following inequality. write the answer in interval notation x^3-4x^2-21x<0 please show work so i can understand this problem better! thanks
6. ### College Algebra 1

What is the interval notation for -4(x+9)^3(x-11)^4(x+6)>0
7. ### Algebra

Find the domain of the function. (Write your answer using interval notation.) sqrt(x)/ (4x^2 + 3x − 1) If you set the bottom equal to zero, I got that x can't be -1 or 1/4. But I'm not sure if that's right, or how to write the …
8. ### Algebra-Interval Notation

I don't remember how to solve this. The question is: For what values of a is the expression 7(x-2)5 negative?
9. ### Pre-Cal: Domain

[Note: I really need help on these Domain questions. I've been struggling with this all day] -Consider the following: f(x)= 5/x , g(x)= 7/(x+7) -Find the solutions to the following: 1). (f+g)(x) 2). Domain of (f+g)(x) [Use interval …
10. ### Algebra

Can you explain to me what is a set notation, interval notation, and inequality notation?

More Similar Questions

Post a New Question