SOLUTION: a quadratic equation f(x)=0 has a solution x=3. Its graph has vertex (-1,-16), what is the other solution for the equation ?

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Question 1089155: a quadratic equation f(x)=0 has a solution x=3. Its graph has vertex (-1,-16), what is the other solution for the equation ?
Answer by ikleyn(52780) About Me  (Show Source):
You can put this solution on YOUR website!
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The other root is 4 = 3-(-1) units to the left from x= -1 (which is the symmetry axis).

So, the other root is x= -5.