mitchelsewbaran
Write the quadratic function in vertex form.
y = x^2 + 8x + 18



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ParthKohli
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Do you know how to complete the square?

mitchelsewbaran
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(b/2)^2

ParthKohli
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Yes, so can you apply that here? I'm sure you can...

mitchelsewbaran
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here are the choices:
y = (x  4)^2  2
y = (x  4)^2 + 2
y = (x + 4)^2  2
y = (x + 4)^2 + 2

ParthKohli
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Okay, but can you add \(\left(b\over 2\right)^2\) to both sides? Do you know what \(b\) is?


ParthKohli
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So what would \(\left(b\over 2\right)^2\) be?

mitchelsewbaran
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16?

ParthKohli
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Yes, so add \(16\) to both sides. :)

mitchelsewbaran
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y = (x + 4)^2  2

ParthKohli
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Please show your work.