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Thread: How to make......the subject

  1. #1 How to make......the subject 
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    In an equation like the formula for calculating the compound interest,

    A=P(1+R/100)^T

    How do you make T the subject??


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  3. #2  
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    this is a homework problem i would imagine.


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  4. #3  
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    If this is a homework/other assignment question, you need to give us more details on how you're approaching it or what specific things trouble you.

    We'll be glad to help once we see how you've attempted it so far and what you need to understand to get on top of it.
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  5. #4  
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    Quote Originally Posted by SVCrankson View Post
    In an equation like the formula for calculating the compound interest,

    A=P(1+R/100)^T

    How do you make T the subject??
    log(A) = T log(P(1+R/100))
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  6. #5  
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    Thanks. It's not a h/w question. I was just wondering how i can make an exponent the subject of an equation
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  7. #6  
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    In general, if the variable you want to make the subject of an equation is an exponent (power), you have to take logarithm on both sides:


    Here I have taken logarithm to base b. However if b is a complicated expression (as in your question) it is better to take logarithm to another base, such as 10 or e. Thus, taking logarithm to base 10:

    Holding on to anger is like drinking poison and expecting the other person to die.
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  8. #7  
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    Thanks
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  9. #8  
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    Quote Originally Posted by SVCrankson View Post
    In an equation like the formula for calculating the compound interest,

    A=P(1+R/100)^T

    How do you make T the subject??
    Its another form is ... .
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  10. #9  
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    Thanks....That makes sense
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