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Mathematics 7 Online
OpenStudy (freemap):

Please Help Me

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: \[\huge {\left( {\frac{1}{3}} \right)^{d - 5}} = {\left( {\frac{1}{3}} \right)^{ - 4}}\]

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

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 \(-(d-5)=...?\)

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):

:)

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