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If [tex] x^2 + 2m = y^2 [/tex], then [tex] \frac{dy}{dx} [/tex] is

Select one:
A. [tex] -x [/tex]
B. [tex] x + 7 [/tex]
C. [tex] 2r + 2 [/tex]


Sagot :

To find [tex]\(\frac{dy}{dx}\)[/tex] for the equation [tex]\(x^2 + 2m = y^2\)[/tex], we need to use implicit differentiation. Let's go through the steps together:

1. Given Equation:
[tex]\[ x^2 + 2m = y^2 \][/tex]

2. Differentiate both sides with respect to [tex]\(x\)[/tex]:
Since [tex]\(m\)[/tex] is a constant, its derivative with respect to [tex]\(x\)[/tex] is [tex]\(0\)[/tex]. Differentiating the equation term by term:

[tex]\[ \frac{d}{dx}(x^2) + \frac{d}{dx}(2m) = \frac{d}{dx}(y^2) \][/tex]

[tex]\[ \frac{d}{dx}(x^2) + \frac{d}{dx}(2m) = \frac{d}{dx}(y^2) \][/tex]

3. Compute the derivatives:
[tex]\[ \frac{d}{dx}(x^2) = 2x \][/tex]
[tex]\[ \frac{d}{dx}(2m) = 0 \quad (\text{since } m \text{ is a constant}) \][/tex]
[tex]\[ \frac{d}{dx}(y^2) = 2y \frac{dy}{dx} \quad (\text{by the chain rule}) \][/tex]

4. Substitute these results back into the differentiated equation:
[tex]\[ 2x + 0 = 2y \frac{dy}{dx} \][/tex]

5. Simplify the equation:
[tex]\[ 2x = 2y \frac{dy}{dx} \][/tex]

6. Solve for [tex]\(\frac{dy}{dx}\)[/tex]:
[tex]\[ \frac{dy}{dx} = \frac{2x}{2y} \][/tex]
[tex]\[ \frac{dy}{dx} = \frac{x}{y} \][/tex]

Therefore, the derivative [tex]\(\frac{dy}{dx}\)[/tex] is:
[tex]\(\boxed{\frac{x}{y}}\)[/tex]

None of the provided answer choices match this derivative directly, but based on the given work, the correct [tex]\(\frac{dy}{dx}\)[/tex] should be understood as [tex]\(\frac{x}{y}\)[/tex]. The steps and results are verified and correct as per conventional calculus methods.
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