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Quadratic equations

Instructions:

Solve quadratic equation and find out values of unknown variables x₁ and x₂.

Example

-2.x² - 2.x + 40	=	0	/
	=	0
(x ).(x )	=	0
x₁	=
x₂	=

Solution

-2.x² - 2.x + 40	=	0
x₁	=	-5
x₂	=	4

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