book Maths Puzzle Numerical Ability

please simplfy this
(4x^3-6x^2+5)-(x^2+7x^2-8x-2)

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book Other Question

what is the answer to e^[(pi*sqrt(-1))+1]
and e^[(pi*sqrt(-1))-1]
whats the quadratic eqation for perabola
vertes: (-1,-10)
x-intercepts:-6and 4