book Maths Puzzle Numerical Ability

((((((((Find a third degree polynomialwith real coefficients and with zeros 1 and 3+i.))))))))

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book Other Question

How would I right an equation of the line perpendicular to the line
l: y=-1/4x+2 and passes through point P(3,0)?
Find the equation of the line that passes through the points (-6,2) and (-5,3).
Write your answer in standrard form.