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Homogeneous & Linear Differential Equations · Question 7 of 120

Question 7

EasyOriginal question

f(x,y)f(x, y) is homogeneous of degree 2 and g(x,y)g(x, y) is homogeneous of degree 3. What is the degree of the homogeneous function f(x,y) g(x,y)f(x, y)\,g(x, y)?

Options for question 7

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. f(λx,λy) g(λx,λy)=λ2f⋅λ3g=λ5fgf(\lambda x, \lambda y)\,g(\lambda x, \lambda y) = \lambda^{2}f \cdot \lambda^{3}g = \lambda^{5}fg.

  2. The powers of λ\lambda add, so the degree is 5.

Worth noting

6 multiplies the degrees; for a product the powers of λ\lambda add.

Concept
Degrees of products, quotients and sums
Typical time
60 s
Your time
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The rule this testsHomogeneous equations
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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.