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Mathematics 20 Online
OpenStudy (anonymous):

7+4(28-5^2-3)

OpenStudy (phi):

do you know your "Order of Operations" ?

OpenStudy (anonymous):

yes. its just that it keeps on giving me a different answer

OpenStudy (phi):

the first thing to do is "simplify the expression inside the parens" so you should first do: 28-5^2-3 what should you do first in that expression ?

OpenStudy (anonymous):

exponents

OpenStudy (phi):

you have 5^2 What number is that ?

OpenStudy (anonymous):

25

OpenStudy (phi):

so 28-5^2-3 becomes 28 - 25 -3 now do the operations left to right. First do (28-25)

OpenStudy (anonymous):

yeah. then it will be 7+4(3-3)

OpenStudy (phi):

yes. you still have to simplify the stuff inside the parens first. what is 3 - 3 ?

OpenStudy (anonymous):

0

OpenStudy (phi):

7+4(3-3) becomes 7+4 * 0

OpenStudy (phi):

now do multiply before add

OpenStudy (anonymous):

omg thank you. now I see in what I made the mistake. :)

OpenStudy (phi):

you get 7+4*0 becomes 7+0 which is 7

OpenStudy (anonymous):

yeah. thanks

OpenStudy (phi):

yw

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