The Equation of a Tangent

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GCSE Maths revision tutorial video.

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Why the tangent meets the circle at the (4, -3) (as written in the task), however, on the drawing, the point is at (-4, 3)??

maxuix

(he drew (3, -4) instead of (4, -3) as the question says. that’s why you may have different answers xx. he’s wrong

saff

Could you do like a list for all topics in non calc and calc please!

leahlester

@mathsgenie thank you your videos really helped me in gcse maths

tahir

Can't even plot a point, but thanks pretty helpful

bensherman

At 5:56, wouldn't it be -25/12 + 144/12 = 119/12
instead of what you did where you ended up with 169/12 ? I am very confused

Aurora-wbwc

@ 2:22, I don't understand how -4/3 switches to 3/4??? Do you just flip them over to find the gradient of the tangent from the gradient of the radius? If so does the -4 just become a positive 4 when flipped?

thispatricia

For 7:09 does it matter if you left the gradient as -6/8 instead of simplifying it into -3/4 ??

LemellsHater

Could you implicitly differentiate the equation of a circle to find the gradient of a tangent?

freddiemarsh

There is a mistake in x and y definitely

astraaaaaaaaaaaaaa

why at 5:14 do you get -5? doing the reciprocal is it always minus?

jen

Does that mean the radius is for nothing when it comes to finding equation of tangent?

sgsnakex

If changes in y's over changes in X's equal -4 and four thirds why have I got minus 3 quarters

Xenif

BTW do u have a drawing tablet to do this, if not u should get one, then again u only need to do make such videos very rarely cos new (sub)topics come out very slowly/rarely.

unddmn

Why would you use both fractions and decimal numbers in the answer?! While the answer might be mathematically corect, it's extremely inelegant. Not sure it'd cut the muster with the examining body, too.

zagi