This video tutorial explains how to determine the intervals for which a linear first-order differential equation has unique solutions. It covers the conditions under which these solutions exist, focusing on the continuity of functions involved. The tutorial includes three examples, each demonstrating how to find these intervals for different types of differential equations, including those with natural logarithms and trigonometric functions.

What is the main condition for a linear first-order differential equation to have a unique solution?

• The equation must be homogeneous.

• P(x) and F(x) must be differentiable.

• P(x) and F(x) must be continuous on an open interval.

• The initial condition must be zero.

What is the interval of validity in the context of differential equations?

• The interval where the initial condition is defined.

• The interval where the solution is infinite.

• The interval where the solution is zero.

• The interval where P(x) and F(x) are continuous.

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CCSS.HSF-IF.C.7D

In the first example, what is the interval of continuity for P(x) = 3/x?

• From zero to infinity.

• From negative infinity to infinity.

• From negative infinity to zero.

• From zero to one.

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CCSS.HSF-IF.C.7D

For the function F(x) = 4x, what is the interval of continuity?

• From negative infinity to zero.

• From zero to infinity.

• From negative infinity to infinity.

• From zero to one.

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CCSS.HSF-IF.C.7D

In the second example, why must x = 3 be excluded from the interval of continuity for P(x) = ln(x)/(x-3)?

• Because ln(x) is zero at x = 3.

• Because division by zero occurs at x = 3.

• Because ln(x) is undefined at x = 3.

• Because x = 3 is not a real number.

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CCSS.HSF-IF.C.7D

What is the interval of continuity for F(x) = 2x/(x-3) in the second example?

• From negative infinity to zero.

• From zero to three.

• From negative infinity to three and from three to infinity.

• From three to infinity.

In the third example, what causes P(x) = tan(x) to be discontinuous?

• When x is zero.

• When x is a multiple of pi.

• When x is a multiple of pi/2.

• When x is a multiple of pi/4.

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CCSS.HSF-IF.C.7E

For F(x) = sin(x), what is the interval of continuity?

• From negative infinity to infinity.

• From zero to infinity.

• From zero to pi.

• From negative infinity to zero.

In the context of the third example, what is the interval of validity for the initial condition y(pi) = 0?

• From 3pi/2 to 5pi/2.

• From pi to 2pi.

• From 0 to pi.

• From pi/2 to 3pi/2.

What is the significance of the interval where P(x) is continuous in determining unique solutions?

• It determines where the solution is zero.

• It determines where the solution is infinite.

• It determines where the differential equation has unique solutions.

• It determines where the initial condition is valid.