Solve a problem of your own!
Download the Studdy App!

Math

Math Snap

PROBLEM

Find the domains of the functions: a. q(x)h(x)\frac{q(x)}{h(x)}, b. q(h(x))q(h(x)), c. h(q(x))h(q(x)) where q(x)=1xq(x)=\frac{1}{\sqrt{x}} and h(x)=x225h(x)=x^{2}-25.

STEP 1

Assumptions1. We are given two functions q(x)=1xq(x)=\frac{1}{\sqrt{x}} and h(x)=x25h(x)=x^{}-25
. We are asked to find the domain of three different functions q(x)h(x)\frac{q(x)}{h(x)}, q(h(x))q(h(x)), and h(q(x))h(q(x))
3. The domain of a function is the set of all possible input values (x-values) that will output real numbers

STEP 2

Let's start with the first function q(x)h(x)\frac{q(x)}{h(x)}. The domain of this function is all x-values for which both q(x)q(x) and h(x)h(x) are defined and h(x)0h(x) \neq0.

STEP 3

The function q(x)q(x) is undefined when x0x \leq0 because we can't take the square root of a negative number or zero. So, the domain of q(x)q(x) is x>0x >0.

STEP 4

The function h(x)h(x) is always defined for all real numbers. However, for the function q(x)h(x)\frac{q(x)}{h(x)}, we must exclude values of xx for which h(x)=0h(x) =0.

STEP 5

To find the values of xx for which h(x)=0h(x) =0, we solve the equation x225=0x^{2}-25=0.
x225=0x^{2}-25=0

STEP 6

olving the equation gives us two solutions x=5x=5 and x=5x=-5. Therefore, for the function q(x)h(x)\frac{q(x)}{h(x)}, we must exclude these two values.

STEP 7

Combining the domains of q(x)q(x) and h(x)h(x), we find that the domain of q(x)h(x)\frac{q(x)}{h(x)} is x>0x >0 and x5,5x \neq5, -5.

STEP 8

Now, let's find the domain of the second function q(h(x))q(h(x)). The domain of this function is all x-values for which h(x)h(x) is defined and h(x)>0h(x) >0.

STEP 9

As we found earlier, h(x)h(x) is always defined for all real numbers. However, for the function q(h(x))q(h(x)), we must exclude values of xx for which h(x)h(x) \leq.

STEP 10

To find the values of xx for which h(x)0h(x) \leq0, we solve the inequality x2250x^{2}-25 \leq0.
x2250x^{2}-25 \leq0

STEP 11

olving the inequality gives us the solution 5x5-5 \leq x \leq5. Therefore, for the function q(h(x))q(h(x)), we must exclude these values.

STEP 12

So, the domain of q(h(x))q(h(x)) is x<5x < -5 or x>5x >5, which can also be written as x>5|x| >5.

STEP 13

Finally, let's find the domain of the third function h(q(x))h(q(x)). The domain of this function is all x-values for which q(x)q(x) is defined.

SOLUTION

As we found earlier, q(x)q(x) is undefined when x0x \leq0. So, the domain of h(q(x))h(q(x)) is x>0x >0.
In conclusion,
a. The domain of q(x)h(x)\frac{q(x)}{h(x)} is x>0x >0 and x,x \neq, -
b. The domain of q(h(x))q(h(x)) is x>|x| >
c. The domain of h(q(x))h(q(x)) is x>0x >0

Was this helpful?
banner

Start understanding anything

Get started now for free.

OverviewParentsContactPolicyTerms
TwitterInstagramFacebookTikTokDiscord