# I need urgent help please with this question

#1
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3 months ago
#2
what have you done so far?
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#3
(Original post by bexxr)
what have you done so far?
I didn’t know how to start sorry
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3 months ago
#4
(Original post by Matheen1)
I didn’t know how to start sorry
Have you filled in the missing values in the spreadsheet?
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#5
(Original post by bexxr)
Have you filled in the missing values in the spreadsheet?
I didn’t know how to work out the values for the spreadsheet
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3 months ago
#6
(Original post by Matheen1)
I didn’t know how to work out the values for the spreadsheet
Start with cell D5. This is x + h, which is easily calculated.

Hint: look at the other cells in column D and see how they were calculated.
Last edited by bexxr; 3 months ago
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#7
(Original post by bexxr)
Start with cell D5. This is x + h, which is easily calculated.

Hint: look at the other cells in column D and see how they were calculated.
Oh ok d5 is 2.001
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3 months ago
#8
(Original post by Matheen1)
Oh ok d5 is 2.001
Yes!

Cell E3 - do you understand the notation of f(x+h)?
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#9
No not really sorry.
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3 months ago
#10
Okay, so the curve is y=x^4. Therefore, we can write this as f(x)=x^4, yes?

So...

f(x)=x^4
f(2)=2^4
f(x+h)= ???
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#11
(Original post by bexxr)
Okay, so the curve is y=x^4. Therefore, we can write this as f(x)=x^4, yes?

So...

f(x)=x^4
f(2)=2^4
f(x+h)= ???
Ok so f(x+h) = 19.4481
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3 months ago
#12
(Original post by Matheen1)
Ok so f(x+h) = 19.4481
Yes
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3 months ago
#13
Column F is the gradient between 2 points.

First point:
The x-coordinate is x (column A) and the y-coordinate is f(x) (column B)

Second point
The x-coordinate is x+h (column D) and the y-coordinate is f(x+h) (column E)

Write down the 2 points from row 4 and then you should be able to calculate the gradient between them using the gradient/slope formula.
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#14
(Original post by bexxr)
Column F is the gradient between 2 points.

First point:
The x-coordinate is x (column A) and the y-coordinate is f(x) (column B)

Second point
The x-coordinate is x+h (column D) and the y-coordinate is f(x+h) (column E)

Write down the 2 points from row 4 and then you should be able to calculate the gradient between them using the gradient/slope formula.
What 2 points do you mean?
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3 months ago
#15
(Original post by Matheen1)
What 2 points do you mean?
I've literally told you how to obtain the x and y coordinates for each point by pulling them from the spreadsheet. Please read my instructions again and try.
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#16
(Original post by bexxr)
I've literally told you how to obtain the x and y coordinates for each point by pulling them from the spreadsheet. Please read my instructions again and try.
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3 months ago
#17
(Original post by Matheen1)
no worries! And yes, that's correct

Now you can move on to part b) (I'm assuming you know how to differentiate by first principles).
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