You can find the minimum of a quadratic if the equation gives a “U shape”, however in these it will not. The minimum value for these will just be zero i.e. all lengths are zero and the shape does not exist.
You can yes, however worth noting: - this question says using differentiation. If that happens in the exam you'd not score marks. - CTS is helpful for quadratics but you may see problems in the future where the resulting equation is a higher power so differentiation will be the right approach.
for the last part on the first example when you are working out the maximum value, why do you do da/dx = 0, isnt that for stationary points not for maxima points? i thought maxima points is when x is less than 0
most underrated revision channel ever, good job once again sir, u have helped me understand a topic I really struggled with, what a legend.
never understood this well enough, but you explained it so well! Hopefully ill smash this question if one comes up tomorrow :)
That's very kind!
i learnt this a while ago and couldn't remember how to do it - ty for the quick and informative video
A day before my exam, thank you so very much ❤
THANK YOU, life saver fr!!
I ve been searching for help in this topic , thank youuuu
You're welcome 😊
You're such a lifesaver, you thought about doing videos for A-level maths content?
One day yes
thank youuu!
would there ever be a question that asked for the minimum point? would u just do the same thing? tysm!
You can find the minimum of a quadratic if the equation gives a “U shape”, however in these it will not. The minimum value for these will just be zero i.e. all lengths are zero and the shape does not exist.
in 4:11 couldnt you just complete the square
You can yes, however worth noting:
- this question says using differentiation. If that happens in the exam you'd not score marks.
- CTS is helpful for quadratics but you may see problems in the future where the resulting equation is a higher power so differentiation will be the right approach.
for the last part on the first example when you are working out the maximum value, why do you do da/dx = 0, isnt that for stationary points not for maxima points? i thought maxima points is when x is less than 0
Maxima are stationary points. To find a maximum point you must first look for a stationary point.
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😮