book Maths Puzzle Numerical Ability

Graph the polynomial. Find all intercepts, right and left side behavior.
f(x)=x^5-5x^4+6x^3+8x^2-40x+48

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book Other Question

Find three consecutive even integers such as that twice the sum of the first and second is 10 more then three times the third. I am having trouble figuring out a problem I have for math homework:
8x(t)4y-4x(t)3-12x(t)2y

t= to the power

It reads: 8 x to the fourth y minus 4 x to the 3rd -12 x to the