Homework Help: College Algebra

Posted by Lee on Friday, October 22, 2010 at 5:57am.

I could not figure out the answer to this Problem:

The quadratic function
f(x)= -2x^2 =4x +3 can be used to solve the following inequality:
-2x^2 -4x < -3

First use the Quadratic Formula to find the x-intercept of f.

This problem asks that the answer be seperated by commas and rounded to nearest tenth

Also solution set is requested and put in interval notation and numbers rounded to nearest tenth

My answers to this problem where incorrect The x-intercepts I found were 2.4,5.8
and the solution set I had is: (-infinity, 2.4] union [5.8,infinity)

College Algebra - Reiny, Friday, October 22, 2010 at 8:25am
solving the quadratic
-2x^2 - 4x + 3 = 0 or
2x^2 + 4x - 3 = 0 yields
x = (-4 ą √40)/4
x = .58 or -2.58 not your answers.

so x < -2.58 OR x > .58

round off and express in the form they want.
College Algebra - Stacy, Friday, October 22, 2010 at 8:47am
So once I have to convert sqrt of 40 and solve from there?
College Algebra - Lee, Friday, October 22, 2010 at 9:51am
Thank you so much for your help.

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