State the domain of function, pa help po pls

Question

asked Nov 20, 2022 233k views

1 Answer

Donparalias · Answer 1 · 2022-11-26T23:35:20+0000

Given:

The functions are:

(1)
h(x)=√(1-x)

(2)
x+y=4

(3)
x^2+y^2=16

To find:

The domain of given functions.

Solution:

Domain is the set of input and x -values.

Value under the square root must be positive because if the number under square root is negative, then it is a complex or imaginary number.

(1)
h(x)=√(1-x)

The function is defined if

$1-x\geq 0$

$1\geq x$

The function is defined for all real values of x which are less than or equal to 1.

Therefore, the domain of the function is (-∞,1].

(2)
x+y=4

It is a linear function and linear function is defined for all real values of x.

Therefore, the domain of the function is (-∞,∞).

(3)
x^2+y^2=16

It can be written as

y^2=16-x^2

$y=\pm √(16-x^2)$

It is defined if

$16-x^2\geq 0$

$16\geq x^2$

$4\geq x\geq -4$

This function defined for all real values of x from -4 to 4.

Therefore, the domain of the function is [-4,4].