Friday

August 22, 2014

August 22, 2014

Posted by **Connor** on Tuesday, August 31, 2010 at 7:27pm.

-----------------=f(x)

2x^3-4x^2-40x+80

Determine all values of x for which f is not defined.

- Pre Calc -
**Dave**, Tuesday, August 31, 2010 at 7:55pmthats supposed to be a fraction all equel to f(x).

- Pre Calc -
**Reiny**, Tuesday, August 31, 2010 at 8:20pmA function is not defined if the denominator is zero

So we just have to look at the bottom which I will assume is

2x^3 - 4x^2 - 40x + 80

by grouping

= 2x^2(x-2) - 40(x-2)

= (x-2)(2x^2 - 40)

so x-2 cannot be zero, or x ≠ 2

or

2x^ - 40 ≠ 0

x^2 ≠ 20

x ≠ ±√20 or ±2√5

so x ≠ 2, 2√5, -2√5

**Related Questions**

Pre Calc - 7x^3-24x^2-19x+12 -----------------=f(x) 2x^3-4x^2-40x+80 -Determine ...

pre-calc - what are all the real zeros for 1x^5+2x^4+4x^3+19x^2+9x-5?

Math(pre-calc) - what are all the real zeros for 1x^5+2x^4+4x^3+19x^2+9x-5?

calc 2 - (last one) ... Let f(t) be a function defined for all values of t. The...

Math(Pre=Calc) - The first term in a sequence of number is t1 = 4. The terms ...

algebra - Did I do this problem the correct way if so is there a shorter way to ...

Pre-Calc - for the conic y=5x^2-40x+78 find an equation in standard form and its...

Algebra - use factor theorem to determine whether x+2 is a factor of f(x). if it...

Calc - Given function f defined by f(x) = ( 1- x)³. What are all values of c, in...

algebra 2 - find all the zeroes of: x^5-3x^4-24x^3-72x^2-25x+75=0 5x^5-20x^4-40x...