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17.07.2020 •
Mathematics
h(x)= 4/x-5 What is the domain of h? A: All real values of x such that x ≠ 4 B:All real values of x such that x ≥ 4 C: All real values of x such that x ≠5 D: All real values of x such that x ≤ 5 E: All real values of x
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Ответ:
C. All real values of x such that x ≠ 5
Step-by-step explanation:
Given
h(x) = 4/(x - 5)
Required
Determine the domain of the function
To get the domain of the function, we start by writing out the denominator in the following format:
x - 5 ≠ 0
Add 5 to both sides
x - 5 + 5 ≠ 0 + 5
x ≠ 5
The domain can be written in builder notation as follows
x = { x ∈ R: x≠ 5}
The above expression implies that the domain of the function is all real values of x but x ≠ 5
From the list of options, the correct answer is C.
Ответ:
Expression gives the perimeter = 4x√17
Step-by-step explanation:
∵ The diagonals of the rhombus ⊥ to each other and
bisects each other
∴ Half the longest diagonal = 8x/2 = 4x
∴ Half the shortest diagonal = 2x/2 = x
Use Pythagoras theorem to find the length of the side of the rhombus
∴ The length of the side = √[(4x)² + (x)²] = √[16x² + x²] = √(17x²)
∴ S = x√17
∵ Perimeter of the rhombus = 4 × S
∴ P = 4 × x√17 = 4x√17