exam Maths Puzzle Numerical Ability

Please help me. Simplify:
a) (8^n)(2(^n-2)(4(^n+1)(3^n)/sqrt3^2n
b) (2^x)(8(^x+2)(32(^2x-1)/8^x)(sqrt4^x)

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exam Other Question

find an exponential function of the form f(x)=ba^x+c with y- intercept 2, horizontal asymptote y=-2, that passes through the point P(1,4) if 7 is subtracted from twice a number, the result is 5. find the number.