Book Maths Puzzle Algebra

write as a single logarithm

51logx-2logx

1/3log3x+1/4logx

log1-log18

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Book Other Question

The actual equasion is (2/B)=-4 the answer I assume should be -1/2. In the steps of multiplying both sides by (B) than multiplying both sides by -4. Is this correct if not pleas Use the quodrofic formula to solve

2x62+5x=0

3x^2=6x-8