How do you solve the quadratic x^2-2x-8=0 using any method?

1 Answer
Alan P.
Sep 8, 2016

x in {-2,4}

Explanation:

x^2-2x-8=0 can be factored as
color(white)("XXX")(x+2)(x-4)=0
which implies
either
color(white)("XXX")x+2=0color(white)("XX")rarrcolor(white)("XX")x=-2
or
color(white)("XXX")x-4=0color(white)("XX")rarrcolor(white)("XX")x=4

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