Mathematics
12 Online
OpenStudy (anonymous):
FAN AND MEDAL AWARDED
Evaluate the expression, using the given value of the variable.
z ÷ 3 – 5z + 4(z – 2) when z = 12
A.
–98
B.
–96
C.
–16
D.
–14
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OpenStudy (aravindg):
Ok use BODMAS rule and substitute x=12 in the equation
OpenStudy (aravindg):
@alahrichi1
OpenStudy (anonymous):
I did that and got -5
OpenStudy (aravindg):
try again?
OpenStudy (aravindg):
can u please show ur step then i can know where you are making mistake
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OpenStudy (aravindg):
@alahrichi1 ?
OpenStudy (anonymous):
=12+3-5*12+4(12-2)
=12+3-5*12+4*10
=12+3-60+4*10
=12+3-60+40
=15-100
=-85
OpenStudy (aravindg):
ok ur first step is right
OpenStudy (aravindg):
you considered the brackets and got 10
OpenStudy (anonymous):
yes..
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OpenStudy (aravindg):
and note it is z/3 not z+3 !!
OpenStudy (anonymous):
OMG!!!!!!!!!!!! thanks sooo much!! thats where my mistake was!!!
OpenStudy (aravindg):
=12/3-5*12+4*10
=12/3-5*12+40
now do division
OpenStudy (aravindg):
yw :)
OpenStudy (anonymous):
ok 1 sec
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OpenStudy (anonymous):
-96
OpenStudy (aravindg):
try again?
OpenStudy (aravindg):
show me ur step after
=12/3-5*12+4*10
=12/3-5*12+40
OpenStudy (anonymous):
=4-60+40
=-96 :D
OpenStudy (aravindg):
-60+40=??
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OpenStudy (aravindg):
reply pls i gotta sleep after finishing this !!
OpenStudy (aravindg):
@alahrichi1 .......
OpenStudy (anonymous):
-20
OpenStudy (aravindg):
-20+4=?
OpenStudy (anonymous):
no bro, not -60+40 its 4 minus 60
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OpenStudy (aravindg):
both are same :)
OpenStudy (aravindg):
subtraction is actually a form of addition only :)
OpenStudy (aravindg):
whatevr way you do the answer will be same
OpenStudy (aravindg):
4-60=?
OpenStudy (aravindg):
please reply fast ?
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OpenStudy (anonymous):
-56
OpenStudy (aravindg):
-56+40 =?
OpenStudy (anonymous):
-16
OpenStudy (aravindg):
:D you done it !!!
OpenStudy (aravindg):
if you did other way also you will get -16
see
=4-60+40
=4-20
=-16
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OpenStudy (aravindg):
beauty of mathematics !!
OpenStudy (anonymous):
omg dude u are a legend
OpenStudy (aravindg):
:D thanks ..nw i can sleep :)
OpenStudy (anonymous):
good nite
OpenStudy (aravindg):
thanks hav good day/night :)
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OpenStudy (anonymous):
u too