book Maths Puzzle Numerical Ability

MULTIPLY AND SIMPLIFY

5i(4i-6)

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book Other Question

solve for x
log(3,64)-log(3,8/3) + log(3,2)=log(3,4x) i asked this question and got an answer but i still do not understand it, can someone make it a little bit more easier to understand, if thats even possible ;) thank you very much.