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topjm [15]
3 years ago
15

Hi. I need help with these questions (see image)Please show workings.​

Mathematics
1 answer:
alukav5142 [94]3 years ago
4 0

Answer:

A: \frac{1}{2\sqrt{x-1} }

B:\frac{1}{4\sqrt[4]{x^{3} } }

c: 2x

Step-by-step explanation:

To find the derivative of x raised to the nth power we use the following template

x^{n}=nx^{n-1}

Something else to keep in mind is that

\sqrt[n]{x^{y}}=x^{y/n}

So knowing this we can rewrite a as follows

\sqrt{x-1} =(x-1)^{1/2}

so we can use the template above and get

\frac{1}{2}(x-1)^{.5-1}

So that simplifies to

\frac{1}{2}*(x-1)^{-\frac{1}{2}

\frac{(x-1)^{-.5}}{2}

\frac{1}{2\sqrt{x-1} }

B: Same kind of deal here

\sqrt[4]{x}=x^{\frac{1}{4} }

\frac{1}{4} *x^{\frac{1}{4}-1}

\frac{x^{-\frac{3}{4}}}{4} =\frac{1}{4\sqrt[4]{x^{3} } }

C: this one is by far the easiest because the derivative of a constant is 0 so we can just apply the same template from before and get

2x

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