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    Hi, can someone look at this log question(attached). I dont understand what they want me to prove....I need help on both Qc and Qd
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    (Original post by Bengaltiger)
    Hi, can someone look at this log question(attached). I dont understand what they want me to prove....I need help on both Qc and Qd
    to do part (c) take 2 to the power of both sides and simplify

    then factorise the cubic - I'm guessing that of the three roots it only makes sense to put one of them back into the original equation - say because only one is positive and the others negative
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    Ok, i think i got the idea. But how about the next part.

    State, with a reason, the value of x that satisfies equation(I)
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    (Original post by Bengaltiger)
    Ok, i think i got the idea. But how about the next part.

    State, with a reason, the value of x that satisfies equation(I)
    Well as I said, the roots - which are -1, -2, 4 - don't all make sense to put back in the original equation
 
 
 
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