Substituting into formulae (Maths GCSE Foundation and HIgher)

How to substitute into a formula: The principle and ideas here are actually very straightforward but there are one or two places where you might get caught out. In this video I go through lots of the common types of situations you might come across. If there's a particular type of question that you need help with then you can jump straight to that using the links below. Enjoy!

1:06 z=x+2 Find z when x=7
1:34 l=7m Find l when m=5
2:08 l=mn Find l when m=7 and n=4
2:47 l=2m-n Find l when m=5 and n=2
3:28 l=m+n² Find l when m=10 and n=6)
4:11 p=r²+6 find p when r=-9
5:09 a=3b² find a when b=5
5:56 p=q+r find p when q=5 and r=-13
6:55 r=2q+3p find r when q=4 and p=-11
8:11 p=q-r find p when q=-4 and r=-11
9.21 r=5q-7p find r when q=2 and p=-6
10:26 c=5/9 (f-32) find c when f=212

[yoyomonster]

Thanks a bunch this really helped me out

[redford]

Hey thanks i got one of the best marks in the class because of this! Still i can do better

[joshuahhubbart]

Amazing video great explanation thank you!

[ammorning.]

you are very handsome and wonderful teacher. Keep it up and thank you very much. (I will subscribe and share your videos)

[surya_vy]

but professor lol.. at 5:07, -9 squared is -81 right?? and the when you add 6, it'll become -75 and not 87... am i incorrect? so then p will be -75??

[gamingnex]

This is GCSE work? I’m in year 7 and I do this work😂