SOLUTION: PLEASEEE I NEED HELP WITH THIS ONE> Quadratic equation....please dont say 2.665 and -2.65. BUt here is the equation 18x^2-128 (FOIL)(WITH 4 SPACES)I THINK. pleasehelp it is f

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: PLEASEEE I NEED HELP WITH THIS ONE> Quadratic equation....please dont say 2.665 and -2.65. BUt here is the equation 18x^2-128 (FOIL)(WITH 4 SPACES)I THINK. pleasehelp it is f      Log On


   

Question 293152: PLEASEEE I NEED HELP WITH THIS ONE> Quadratic equation....please dont say 2.665 and -2.65. BUt here is the equation
18x^2-128
(FOIL)(WITH 4 SPACES)I THINK. pleasehelp it is for carneigie learning online. I am a freshman and this is the only problem i cant figure out
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
18x%5E2-128 Start with the given expression.


2%289x%5E2-64%29 Factor out the GCF 2.


2%283x%2B8%29%283x-8%29 Now factor 9x%5E2-64 to get %283x%2B8%29%283x-8%29 (use the difference of squares formula)


So 18x%5E2-128 factors to 2%283x%2B8%29%283x-8%29


In other words, 18x%5E2-128=2%283x%2B8%29%283x-8%29