The Maths Prof: Changing Subject of Formula EXAM QUESTIONS

This video contains a variety of exam questions on changing the subject of a formula (includes fractions, squaring, square rooting etc.). If you like, grab a pen, some paper and your calculator to have a go at some yourself! You can forward to the end of each example to check if your answer is correct... :-)
Answer to question 1 at 3:07
Answer to question 2 at 6:15
Answer to question 3 at 7:57
Answer to question 4 at 10:00
Answer to question 5 at 12:39
I hope you find the lesson useful! Subscribe to my YouTube channel to stay up to date with new uploads and follow me on Instagram @themathsprof for more maths! :-)

[eugenewilliams]

I'm 62 years old. This is the first time someone has made math this clear !🙂👌

[thatboyany]

Maths Prof . I owe you 1 million dollars. I now understand the math than in class. Thanks a lot

[methulidikkapitiya]

Dear Math Prof,
Even the dictionary fails to give me a word to express how grateful I am to you. This is exactly how I wished for Math to be taught. I can't thank you enough!!!

[AlibotFR]

am i the only one who doesnt know how to thank her if she replied really i appreciate your work your the best your better than all teachers on earth !

[mondesitahani]

Thanks a lot Maths Prof it really makes math so easy and understandable

[NotMarkKnopfler]

I'm 51 and now learning the maths that I was incapable of learning when I was at school! 👍

[MuhammadAdisa-epso]

thanks prof you really make your tile worth

[nehasingh-pxgw]

It deserves 2 million views or more than that ❤️

[jacquesdisles]

You're a great teacher. That would be tested in the final exam for twelfth grade. I will watch that video for more. Thank you for your wonderful tutorials and have a blessed day and stay safe. 😁😁😁🙌

[the_.godfather_..]

👏👏 thank you very much prof this really helps me all the way in southern Africa , Namibia

[alialsuod]

Thanks Mam
Did pass exams beautifully bcz of you
Thanks

[musadem]

Thank you I don't understand it before but now is clear to me keep it up

[iangilbert]

You are a brilliant teacher. And you have a lovely smile :)

[mnekidwell]

Wow. It's never been this easy. Thank you so much

[zoey]

i just found your channel and your videos are so helpful! thank you

[ZachDrake]

I did notice a pro and a con with your first example.

PRO : With this example you showed that quadratic equations, where y is a quadratic function of x, can be rearranged. The key is to start with converting the quadratic from standard form to vertex form. In standard form, quadratics have x terms with different powers, making it impossible to isolate x. In vertex form, it is written with one x value going through an addition/subtraction, then squared, and multiplied by a number, and then adding/subtracting a number. The fact that there is one x value listed in vertex form means there is no conflict of powers of x like in standard form, now making it possible to isolate x.

CON : The one gripe I had is the fact that when you got rid of the square by square rooting, you forgot to mention that it can be a positive root and/or a negative root, since squaring any real number, positive or negative, always gives a positive. So, the answer is 4 + or - that square root, with 4 out in front so as to show it is not inside the root. The same goes for the pythagorean theorem example. I figured this out when I tried graphing similar examples.

[onsku]

Lovely!! It*s easy to watch this very clear teaching =) Br. Onni from Finland

[rub]

Very very helpful, I have a math test and this was gold

[RaidenTheTomb]

Hi MathProf how would you make t the subject of the formula in the S=ut+at^2 expression

[babe]

your lessons are really easy to understand