Thursday, February 5, 2015

Find the largest domain for the following function: g(x) = (x^2 - 10)/3x^2 - 12what is the largest domain of this function

In this case, the denominator of the function impose the
domain of definition.


We'll impose the constraint of
existence of the function:


3x^2 - 12 different
from 0


In other words, the domain of definition will
contain x values that don't cancel the denominator.


We'll
compute the roots of the equation


3x^2 - 12 =
0


We'll divide by 3 both
sides:


x^2 - 4 = 0


Since it is
a difference of squares, we'll write it using the
formula:


a^2 - b^2 =
(a-b)(a+b)


x^2 - 4 =
(x-2)(x+2)


But x^2 - 4 = 0,
so


(x-2)(x+2) = 0


We'll put
each factor as 0:


x - 2 = 0


x
= 2


x + 2 = 0


x =
-2


The domain of definition is the real set
R, rejecting the roots of the equation from
denominator.


R - {-2 ;
+2}

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