waecmaths question:
Given that $a=\log 7$ and $b=\log 2$ express $\log 35$ in terms of a and b
Option A:
a + b +1
Option B:
ab – 1
Option C:
a – b +1
Option D:
b – a +1
waecmaths solution:
$\begin{align} & \log 35=\log \frac{70}{2}=\log 7+log10-log2 \\ & \text{Since }a=\log 7,\text{ }b=\log 2 \\ & \log 35=a+1-b \\ & \log 35=a-b+1 \\\end{align}$
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