exam Maths Puzzle Numerical Ability

Solve for x:
8(^2x)+8^x-12=0

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exam Other Question

Given: CD bisects AB, AB bisects CD
Prove: triangle AED is congruent to triangle BEC PLEASE HELP ME WITH THIS PROBLEM:
Let f(x)=x^3-8x^2+17x-9. Use the factor theorem to find other solutions to f(x)-f(1)=0, besides x=1.