Question 13

loading...

Prev/Next links

waecmaths question: 

If ${{8}^{x+1}}=\frac{1}{4}$ fins x

Option A: 

$-\tfrac{5}{3}$

Option B: 

–1

Option C: 

$-\tfrac{1}{3}$

Option D: 

$\tfrac{1}{3}$

waecmaths solution: 

$\begin{align}  & {{8}^{x+1}}=\frac{1}{4} \\ & {{2}^{3(x+1)}}={{2}^{-2}} \\ & \text{Equating the base} \\ & 3(x+1)=-2 \\ & 3x+3=-2 \\ & 3x=-5 \\ & x=-\tfrac{5}{3} \\\end{align}$

maths year: 
maths topics: