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

Fill in the blanks:

_ _ - ( _ / _ ) =9

the only numbers you can use are 3, 4, 6, 8, and 9

the same goes for this problem:

_ _ / _ + _ _ = 418
Rewrite the equation 2x - 3y = -6 as a funcion of x.