Math Problems, help! (Expressing values)?
1. Express 64 as
a. A power of 2
b. A power of 4
c. A power of 16
2. Express 32
a. A power of 2
b. A power of 4
c. A power of 1/2
If you could kindly explain how to do these sums, it will really help me for my test tomorrow.
Favorite Answer
b) 16^x = 32. Now 2^4 = 16, while 2^5 = 32. So we need (2^4)^x = 2^5, and so 4x = 5, and x = 5/4. Thus 16^(5/4) = 32
a^1/3 = .3
(a^1/3)^3 = a, so a = .3^3. Use this technique on b and c
lets start with the power of 2 for 64
64=2×32 or
2x2x16 or
2x2x2x8 hopefully you see where this is going =D
64=2 x 2 x 2 x 2 x 2 x 2
so then you add up your 2s and you’re left with 2^6
now for the power of 4
64=4 x 4 x 4
and then add up your 4s and have 4^3
now 16 is a little more difficult because it won’t come out nice
knowing that 64=16×8
so 8 is half of 16 so we can look at it like 64=16x(.5×16) so if you add up the 16s you would have 1.5
so 16^1.5
then you can do the same thing with 32
32= 2 x 2 x 2 x 2 x 2
32= 4 x 4 x (.5×4)
and then power of fractions is a totally different beast
because if you try to multiply .5 x .5 and so on the numbers are going to keep getting smaller so you’ll have to look at it differently. you can rewrite 1/x^n as x^-n so it will be the the negative version of the power of 2 or 1/2^-5
hope this helps
the first power of 2 is 2
the second power of 2 is 2 x 2
the third power of 2 is 2 x 2 x 2
The arithmetic is straightforward for integers.
For vulgar fractions think of using reciprocals, usually expressed as negative numbers.
(It’s a long time since I had to do these.)
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