exam Maths Puzzle Numerical Ability

Reciprocal for (-1/5)(20/5))10)

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exam Other Question

the points (-2,-3),(2,-1) and (10,y) are all in a line (they are co-linear.) Find y. Solve for x: f(x)=X^4-2x^3x^2+8x-4=0
How can I find all possible roots and for this polynomial. How can I sketch a graph of this?
My instructor also uses synthetic divsion after he finds the first root and factor.