exam Maths Puzzle Numerical Ability

could you help me factor completely? i tried where am i wrong?
x^2+2x-80
x^2+160-3x-80
(x^2+160x)-(3x+80)
x^2(x+160)-3(x+80)

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exam Other Question

1/5-2/x-1+3/x+2 it says to use a table of values to graph the function

y=x^2-3