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

1.3x squared-12x 2.2w squared-8w-10 3.4x squared-25 Sketch the graph of the ellipse (x-3)^2/49 + (y+2)^2/9 = 1. Lavel amd find the coordinates of the four vertices of the ellipse. The center of the ellipse is (3,-2).