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Jul 9 2017 06:22pm
Need a little math help.



-2×5^2 + 3×2^3
-3 (13)


-2×25 + 3×8
-39


-50 + 24
-39


-26/-39

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Jul 9 2017 06:56pm
Nvm figured it out.
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Jul 10 2017 08:44am
Quote (MilkMaid @ Jul 10 2017 01:22am)
Need a little math help.



-2×5^2 + 3×2^3
-3 (13)

Your numerator in this sum (that which is "on top" in a fraction) is: -2 * 5^2 + 3*2^3 = -2 * 25 + 3*8 = -50 + 24 = -26.
Your denominator in this sum (that which is at the bottom in a fraction) is: -3(13) = -3 * 13 = -39. So far, we've just rewritten the numerator and denominator to something that's easier to solve.
You may notice that both 26 and 39 are divisible by 13, so the result of -26 / -39 equals -(2*13) / -(3*13). We can remove the minus and the 13 in both the numerator and denominator to find that the answer is 2/3.


-2×25 + 3×8
-39

Note that 25 is equal to 5^2 and that 8 is equal to 2^3. This fraction can be rewritten to what we just started with in the previous assignment and the answer is thus equal to 2/3.


-50 + 24
-39

Note that -50 is equal to -2*25 (as well as -2*5^2). You can tell what we're about to do with the 24 B)

-26/-39

This looks a lot like our first sum as well!

http://i.imgur.com/ncRe9kM.jpg


Hello! Please see quote for further explanation.
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Jul 10 2017 10:55pm
Quote (Forg0tten @ Jul 10 2017 07:44am)
Hello! Please see quote for further explanation.


Thank you. I got stuck on the simplifying part. My brain couldn't get the two numbers to divide evenly lol.
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Jul 14 2017 08:01am
this is late, but just remember PEMDAS when calculating and it should be simple
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction


However you can always simplify, and turn exponents into multiplication (remember 5^6 is just 5*5*5*5*5*5)
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Jul 24 2017 09:03am
2/3 should be the answer if you simplify it out
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Oct 14 2017 10:59am
Quote (MilkMaid @ Jul 9 2017 07:22pm)
Need a little math help.



-2×5^2 + 3×2^3
-3 (13)


-2×25 + 3×8
-39


-50 + 24
-39


-26/-39

http://i.imgur.com/ncRe9kM.jpg



It simplifies more than that. Minus cancels in the numerator and denominator => 26/39. Further 13 divides into the numerator and denominator => 2/3 being the most correct answer.
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Oct 14 2017 12:28pm
dang idk
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Oct 14 2017 01:24pm
P E M D A S


-2*5^2 + 3*2^3
/
-3 (13)
__________

-50 + 24
/
-39
___________

-26
/
-39
_______________

-2/-3
_________

2/3

This post was edited by BigDaddyGurk on Oct 14 2017 01:24pm
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Oct 14 2017 06:05pm
oh dear..........
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