If one root of the equation 2x^2 + 10x+k= 0 is -2, what is the other root?

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- Aug 9th 2010, 12:00 PMMATNTRNGFactoring
If one root of the equation 2

*x*^2 + 10*x*+*k*= 0 is -2, what is the other root? - Aug 9th 2010, 12:10 PMeumyang
Plug in -2 for x and solve for k:

For a quadratic equation the sum of the two roots (I'll call them r1 and r2) is -b/a:

So the other root is -3. - Aug 9th 2010, 12:19 PMArchie Meade