Posted by **Jayson** on Sunday, December 18, 2011 at 12:44am.

1. Determine the interval(s) on which x^2 + 2x -3>0

a)x<-3, x>1

b)-3<x<1

c)x<-3, -3<x<1, x>1

d) x>1

Answer is D, x>1

---------------------------------------

2. Determine when the function f(x)= 3x^3 + 4x^2 -59x -13 is greater than 7.

a) -5<x<1/3

b) -5<x<-1/3, x>4

c) x<4

d) x=-5, -1/3,4

Answer is: B

---------------------------------------

3. Provde the intervals you would check to determine when -5x^2 + 37x> -15x^2 + 12x + 15.

a) x=3, x=-0.5

b) x<-3, -3<x<0.5, x>0.5

c) x<-1, -1<x<15, x>15

d) x= 1, x=15

----------------------------------------

- Precalculus -
**Henry**, Tuesday, December 20, 2011 at 12:09pm
1. Correct.

2. Correct.

3. -5x^2 + 37x > -5x^2 + 12x + 15.

-5x^2 + 5x^2 + 37x - 12x > 15,

Combine like-terms:

25x > 15,

X > 15/25,

X > 3/5.

Ans. = D.

- Precalculus -
**Henry**, Tuesday, December 20, 2011 at 4:51pm
Correction: The -5x^2 on the right side of the inequality sign should be

-15x^2.

## Answer this Question

## Related Questions

- Precalculus - Help with these questions help with these questions~ Thank you 1. ...
- Math - help with these questions~ Thank you 1. Determine the interval(s) on ...
- inequalities - Determine when the function f(x)=3x^3+4x^2-59x-13 is less than 7
- precalculus - Help appreciated~ 1.Use the quadratic formula to determine when f(...
- Precalculus - determine the domain of the function and express in interval ...
- Precalculus(URGENT) - determine the domain of the function and express in ...
- Calculus - The function f(x) is defined as f(x) = -2(x+2)(x-1)^2 = -2(x^3 -3x + ...
- Calculus - 1. Locate the absolute extrema of the function f(x)=cos(pi*x) on the ...
- Honors Pre-Calculus - The prompt says "Graph each function. Determine the ...
- Physics-calc - Suppose the position of an object is given by ->r(vector) = (3...