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Differential Equations · Question 56 of 67

Question 56

MediumOriginal question

If dydx=2xy\frac{dy}{dx} = 2xy and y=3y = 3 when x=0x = 0, what is yy when x=1x = 1?

Options for question 56

Show the answer and explanation
CorrectNot quiteAnswer C

Correct answer: C

Explanation

  1. Separating and integrating gives the general solution; the condition y(0)=3y(0) = 3 fixes the constant.

  2. The particular solution is y=3ex2y = 3 e^{x^{2}}.

  3. At x=1x = 1: y=3ey = 3 e.

Worth noting

Leaving out the constant fixed by the condition gives the wrong curve of the family.

Concept
A particular solution
Typical time
90 s
Your time
—
The rule this testsVariables separable
Practise this chapter →

Ten questions from Differential Equations, at your own pace.

Practise this chapter →

Ten questions from Differential Equations, at your own pace.