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Maths c1 help

Heyheyehy

2^-3 divided by (2^-7)^2

i got 1^11 but my calculator says 2^11?

Reply 1

steve2005

Original post by Heyheyehy

2^-3 divided by (2^-7)^2

i got 1^11 but my calculator says 2^11?

When you divide: you subtract the powers

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(edited 12 years ago)

Reply 2

Elmo_83

yeah! that i sbecuase you must have cancalled 2 in the dinominator wit the two in the numerator which you can not do! otherwise, it fairly simple problem

Reply 3

Heyheyehy

Original post by steve2005

When you divide: you subtract the powers

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I understand this but I always thought that you had to include the numbers as welll, so I cancelled the 2's. If I had..

3^3 X 3^-2 X 3^0 would it equal 9 then or 3?

Reply 4

TenOfThem

You do know that 1^(any power) is 1 I am sure

so you are pretty much saying that a^n / a^m = 1

You will see that your rule still has the a so you still need the 2

Reply 5

Heyheyehy

This is a stupidly easy question but is 2^2 X 2^3 = 2^5 or 4^5??

Reply 6

TenOfThem

Original post by heyheyehy

i understand this but i always thought that you had to include the numbers as welll, so i cancelled the 2's. If i had..

3^3 x 3^-2 x 3^0 would it equal 9 then or 3?

3-2+0 = 1

3^1 = 3

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