exam Maths Puzzle Numerical Ability

I need help with this problem Add, using the vertical method.
5x^2+2x-4,x^2-2x-3 and 2x^2-4x-3

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exam Other Question

A Star emits radiation at 424nm; it would normally emit radiation at 430nm. What is its radial velocity and direction. Given f(x)=5x+7 and g(x)=x^2+7, find (g f)(x)