exam Maths Puzzle Numerical Ability

Solve:
a) (2^x)^2-(3*(2)^x)+2=0
b) (9)(^2x)-(2*(9)^x)-3=0

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exam Other Question

solve algebraically:
log base 2(3x+2) - log base 4(x)=3
if two planes intersect, then their intersection is a what?