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Mathematics 8 Online
OpenStudy (mathmath333):

Frustrating problem

OpenStudy (mathmath333):

\(\normalsize \color{black}{\begin{align}& \text{if}\ \log 242=a,\log 80=b\ \text{and}\ \log 45=c & \hspace{.33em}\\~\\ & \text{express}\ \log36\ \text{in terms of }\ a,b,\ \text{and }\ c.\hspace{.33em}\\~\\ & a.)\ \dfrac{(c-1)(3c+b-4)}{2} \hspace{.33em}\\~\\ & b.)\ \dfrac{(c-1)(3c+b-4)}{3} \hspace{.33em}\\~\\ & c.)\ \dfrac{(c-1)(3c-b-4)}{2} \hspace{.33em}\\~\\ & (d.)\ \text{none of these} \hspace{.33em}\\~\\ \end{align}}\)

OpenStudy (phi):

one thought is to first find the prime factors of each of the given numbers

OpenStudy (mathmath333):

i tried and ended up blundering every time in calculation

OpenStudy (mathmath333):

further i need to solve these problem within 2-3 min

OpenStudy (phi):

are you allowed a calculator?

OpenStudy (mathmath333):

lol no / cheating prohibited

imqwerty (imqwerty):

try out the options lol

OpenStudy (mathmath333):

of cos

imqwerty (imqwerty):

so the answer is.......

OpenStudy (mathmath333):

thats a liitle time tough

OpenStudy (mathmath333):

lol and the book gives none of these at last when i checked

imqwerty (imqwerty):

lol xD i hate when it happens xD

OpenStudy (mathmath333):

the objective here is to i need to observe this problem deeply

imqwerty (imqwerty):

nd i m the guy who likes to do the opposite of what is said to be done. XD

OpenStudy (mathmath333):

what is the minimum time this problem should be solved

imqwerty (imqwerty):

1-1.5min

OpenStudy (mathmath333):

i guess there should be some trick

imqwerty (imqwerty):

there is :)

OpenStudy (chillout):

Is the anwser d?

OpenStudy (lurker):

|dw:1438120503037:dw|

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