exam Maths Puzzle Numerical Ability

help me to simplify

3x^2m^5(2x^4m^2) / 3x^2m^5m^-4

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exam Other Question

sketch the graph y=(x-0)^2-4 vertex, zero's Complete the square in each quadratic function, placing the final answer in the fom of y=a(x-h)^2+k: 1. y=x^2 -6x+16 2.y=3x^2 -6x+7 . Could any one help with these?