exam Maths Puzzle Numerical Ability

quadratic function in standard from for

(0,3) (1,-4) (2,-9)

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Please help me with this problem.
Find a quadratic function with solutions -5+2i and -5-2i and a leading coefficient of 1. please help.find the length and width of rectangle ABCD . Toop left A top right D bottom left B bottom right C .between B and C is P=140 cm. between D and C is x.Thanks for helpin