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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 648

How they perpendicular

MZk

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Like this:

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 648

Why we find tangent

MZk

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I assumed that the question wanted you to find the gradient of the tangent line, but I can't be certain due to the wording of the problem.

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 648

Means??

MZk

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It means that I am not sure if you posted the question correctly, but I suspect that the answer is correct anyway.

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 648

See again this question

MZk

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 648

See again this question

MZk

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Asking for the value of f'(1) is the same as asking what the slope of the tangent line at (1,4) is, so your answer is still correct. Thank you for editing, now there is no ambiguity.

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**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 648

Derivative is tangent line?

MZk

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f'(1) here represents the gradient of the tangent line at x = 1, yes.

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