BishopPatton
  • BishopPatton
What is the value of a2 + 3b ÷ c - 2d when a = 3, b = 8, c = 2, and d = 5 A. 11 B. 12 C. 10 D. 8
Mathematics
chestercat
  • chestercat
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BishopPatton
  • BishopPatton
BishopPatton
  • BishopPatton
BishopPatton
  • BishopPatton
Please help

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BishopPatton
  • BishopPatton
misty1212
  • misty1212
HI!! \[a^2 + 3b ÷ c - 2d \]\[3^2 + 3\times8 ÷ 2 - 2\times 5\]
BishopPatton
  • BishopPatton
so what is the answer? I dont understand it.
triciaal
  • triciaal
|dw:1443450369667:dw|
triciaal
  • triciaal
|dw:1443450462074:dw|
BishopPatton
  • BishopPatton
so what order do i solve it... i know PEMDAS
phi
  • phi
If there are no parens in the original problem, you do not divide by (c-2d)
phi
  • phi
misty substituted in the numbers for the letters \[3^2 + 3\times8 ÷ 2 - 2\times 5\] PEDMAS says to do powers first do you see any powers?
phi
  • phi
or should I say "exponents" ?
BishopPatton
  • BishopPatton
Yes
phi
  • phi
can you simplify 3^2 ?
BishopPatton
  • BishopPatton
so i would do 3 * 3
phi
  • phi
yes
phi
  • phi
\[ 9+ 3\times8 ÷ 2 - 2\times 5\] now do multiplies and divisions
phi
  • phi
I would first tackle 3*8/2 notice the order does not matter: you can do 3*8 and then divide by 2 or you can do 3 * (8/2) either way what do you get ?
BishopPatton
  • BishopPatton
9 + 24 ÷ 2 - 10 = 11
BishopPatton
  • BishopPatton
24 ÷ 2 = 12 + 9 = 21 - 10 = 11
phi
  • phi
yes, 9 +12 -10 we now just have addition (notice subtracting 10 is the same as adding -10) so we could write it like this 9 + 12 + -10 now we can do any order of adding up 9, 12, and -10
BishopPatton
  • BishopPatton
Cool... Thanks soooooo much i wish i could give you 10000 medals
phi
  • phi
yw

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