exam Maths Puzzle Numerical Ability

Solve for x: 2(8)^(4x) - 33(8)^(2x) +16=0

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exam Other Question

a figure shows the graph of f(x) =x3 and g(x) =ax3. what can you conclude about the value of a?
a< -1
-1 <a <o
0<a <1
1<a

Please explain and thank you 7 radical 8 - square root 18