Mathematics
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OpenStudy (freemap):
Please Help Me
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OpenStudy (freemap):
Which equation can be used to find the solution of
OpenStudy (freemap):
A. –d – 5 = 4
B. –d + 5 = 4
C. d – 5 = 4
D.d + 5 = 4
OpenStudy (michele_laino):
we can write this:
\[81 = {3^4} = \frac{1}{{{3^{ - 4}}}} = {\left( {\frac{1}{3}} \right)^{ - 4}}\]
OpenStudy (michele_laino):
\[\huge 81 = {3^4} = \frac{1}{{{3^{ - 4}}}} = {\left( {\frac{1}{3}} \right)^{ - 4}}\]
OpenStudy (michele_laino):
so, after a substitution, we get:
\[\huge {\left( {\frac{1}{3}} \right)^{d - 5}} = {\left( {\frac{1}{3}} \right)^{ - 4}}\]
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OpenStudy (freemap):
I'm just going to make a quick guess A?
OpenStudy (michele_laino):
no, I'm sorry.
If we equate the exponents, we get:
\(d-5=-4\)
OpenStudy (freemap):
how do we solve this
OpenStudy (michele_laino):
please, we have not to solve that equation
OpenStudy (michele_laino):
if we multiply both sides by \(-1\) I get:
\(-(d-5)=-(-4)\)
please simplify
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OpenStudy (freemap):
The reason I said that is because there no answer choice for what you said
OpenStudy (michele_laino):
what is \(-(-4)=...?\)
OpenStudy (freemap):
+4
OpenStudy (michele_laino):
ok!
OpenStudy (michele_laino):
and what is \(-(d-5)=...?\)
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OpenStudy (freemap):
-d-5=4 Thats A
OpenStudy (michele_laino):
no, we have:
\(-d+5=4\)
OpenStudy (michele_laino):
since \(-(d-5)=-d+5\)
OpenStudy (freemap):
ohhhhh ok, Thank you
OpenStudy (michele_laino):
:)