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State the domain of function, pa help po pls

State the domain of function, pa help po pls-example-1

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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].

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