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04-06-2020
Mathematics

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a) the quadratic x^2-4x-21 can be written in the form (x+a)^2+b find the values of and and b

b) hence, or otherwise, solve the equation x^2-4x-21=0

Respuesta :

04-06-2020

Part a. A=-2. B=-25
Part b solutions; x=7 x=-3

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