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secondary 4 | E Maths
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secondary 4 chevron_right E Maths chevron_right Singapore

The qn for this is:
Find the slope of the tangent line to the graph of the given function at the given value of x
find the equation of the tangent line

I got the slope correct but for the equation I got y=3x-3 which is different from the answer the teacher gave

Pls lemme know of the teacher’s answer is wrong?

Date Posted: 2 months ago
Views: 70

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Lim Jia Earn
Lim Jia Earn's answer
29 answers (A Helpful Person)
I just like to state that this method I used is in the A Math syllabus, you tagged this under E Math which I hope you tagged incorrectly, if this is truly under E Math then you’ll be required to plot a graph and find the tangent gradient accordingly (last I recall) ;)
Eric Nicholas K
Eric Nicholas K
2 months ago
I believe R is taking Poly Maths, but had no selection in the list.
Eric Nicholas K
Eric Nicholas K
2 months ago
Slope: 3
Point: (1, 0)

I strongly suspect R formed the equation as follows

y = m (x + c)
0 = 3 (1 + c)
0 = 1 + c
-1 = c

y = 3 (x - 1)
y = 3x - 3

when it should be y = mx + c instead.