# C1 Solomon questionWatch

Thread starter 7 years ago
#1
Edit: Solved - post 5.
0
7 years ago
#2
You're on the right lines. You know the equation of the curve is y=x^2-3x+5, so you should be able to find dy/dx.

Now, dy/dx tells you the gradient of the tangent line to the curve at a given point. You need to find the gradient of the tangent line at the point Q - can you see how to do that?
1
7 years ago
#3
Differentiate equation of the curve, sub in the x value at Q. This will give you the gradient at Q also. So sub that and the coordinates of Q into equation of a straight line. Solve for C. Bingo, you have the equation.
0
7 years ago
#4
(Original post by PoliticallyDiverse)
Hey everyone, I have the question (as below) and cannot figure out how you do question (c).

For a and b, respectively, I have the answers:

(a)

I've tried for (c), but to no avail - could someone assist me, please?

for c), did you work out the gradient at using dy/dx at Q, and then plugged that value into the general equation of a straight line?
0
Thread starter 7 years ago
#5
(Original post by Mark13)
You're on the right lines. You know the equation of the curve is y=x^2-3x+5, so you should be able to find dy/dx.

Now, dy/dx tells you the gradient of the tangent line to the curve at a given point. You need to find the gradient of the tangent line at the point Q - can you see how to do that?
Wow, that seems like I've just missed something extremely simple...

Would it be:

?
0
7 years ago
#6
(Original post by PoliticallyDiverse)
Hey everyone, I have the question (as below) and cannot figure out how you do question (c).

For a and b, respectively, I have the answers:

(a)

I've tried for (c), but to no avail - could someone assist me, please?

Method:

1) differentiate the equation of the curve
2) substitute the x co-ordinate of the point you want to find the tangent at ( x co-ordinate of Q in this case) into
3) What you will get is the gradient of the tangent. Use , where is the x co-ordinate, is the y co-ordinate and m is the gradient to find the equation of the tangent.
0
7 years ago
#7
(Original post by PoliticallyDiverse)
Wow, that seems like I've just missed something extremely simple...

Would it be:

?
Well done.
0
7 years ago
#8
What exactly has it got to do with Solomon?
0
Thread starter 7 years ago
#9
(Original post by joshgoldman)
What exactly has it got to do with Solomon?
It's from a Solomon paper...
0
7 years ago
#10
(Original post by PoliticallyDiverse)
It's from a Solomon paper...
There's a board called Solomon? Coooooool.
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