# value range

• Jan 12th 2011, 07:58 AM
paulaa
value range
Explain and indicate the amount of definition and value range for the function

f(x) = (|x-5|)/(x-5) + 2 * ((|x-4|)(|x-6|))/((x-4)(x-6))

definitionsmängen fick jag till:
Df={x: x>4, x#5,6}=(4,5)U(5,6)U(6,infiniti)
Vf=?
• Jan 12th 2011, 08:09 AM
FernandoRevilla
Hint :

If $a\in\mathbb{R}-\{0\}$ then, $|a|/a=1$ or $|a|/a=-1$

Fernando Revilla
• Jan 12th 2011, 10:30 AM
HallsofIvy
In other words, paulaa, look at the specific intervals, 4< x< 5, 5< x< 6, and 6< x. With FernandoRevilla's suggestion, that should make it very easy.