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Homogeneous & Linear Differential Equations · Question 6 of 120

Question 6

EasyOriginal question

F(x,y)F(x, y) is homogeneous of degree 3 and F(2,−1)=5F(2, -1) = 5. What is F(6,−3)F(6, -3)?

Options for question 6

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. (6,−3)=(3⋅2,3⋅(−1))(6, -3) = (3 \cdot 2, 3 \cdot (-1)), so λ=3\lambda = 3.

  2. F(6,−3)=33F(2,−1)=27×5=135F(6, -3) = 3^{3}F(2, -1) = 27 \times 5 = 135.

Worth noting

15 multiplies by 3 only once, as if the degree were 1.

Concept
A homogeneous function at \((\lambda x, \lambda y)\)
Typical time
60 s
Your time
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The rule this testsHomogeneous equations
Practise this chapter →

Ten questions from Homogeneous & Linear Differential Equations, at your own pace.

Practise this chapter →

Ten questions from Homogeneous & Linear Differential Equations, at your own pace.