powers indices

this video tells you the 7 laws of indices and shows you how to calculate negative and fractional indices and at the very a decimal index and calculating powers and roots of fractions by finding the root of the numerator and denominator separately also a common mistake that even teachers make i did a lot research to find that but the exam board will accept if you make that same mistake as some teachers they are plenty of examples we are working with laws 5 6 and 7

Category:

Education

Tags:

• negative
• fractional
• indices
• index
• decimal
• power
• exponent

[Rowan9789]

you know at 6:50 how does 5 1/6 turn into 81/16?

[MathMikie]

@Rowan9789 the problem was actually 5 1/16 i dont if it isnt clear on the video i know sometimes they may not be and i just changed 5 1?16 to an improper fraction

[Rowan9789]

@MathMikie thanks

[MathMikie]

@Rowan9789 no problem to change you multiply bottom and whole number and add on the top this is then the new top i have a video on changing these too

[sickcombos]

@MathMikie 3 to the power x =81, plz solve it for me.

[MathMikie]

@sickcombos if 3^X=81 you find x is 4 because 3^4=81 to solve you can wtrite as log if you have learned it yet otherwise you can ask how many times do i multiply 3 by itself to get 81 3^2=9 3^3=27 and 3*3*3*3=81 so we stop its the number of 3s we have

[wilfeatscheese]

cheers mate very helpful :)

[MathMikie]

@TheDarkAngel27  id di because i dont like too jump steps as i have learned some people get lost and i wanted to show that i am still following the rules in the same way you can certainly miss out out that step or a few more but i think its best not too skip any first round and i dont if you get harder on your exam thios for A level AS C1 which on that exam i have never seen a question anywhere near as hard some exams may have harder questions but they all solved in the same way

[TheDarkAngel27]

for the (81/16)^ -3/4 you just make it (16/81)^3/4 so it makes it easier for the last step. and you don't have to waste all that time with the 1/(a/b)^x type thing....I've never seen that done.... (a/b)^-x is equal to (b/a)^x haha my math test is two days and I'm pretty sure they'll be harder questions!!! helpful video for revision thou XD