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OpenStudy (anonymous):
find vertex of : f(x)=2x^2+8x+12
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OpenStudy (tkhunny):
Shall we "Complete the Square" or just the formula, -b/2a?
OpenStudy (anonymous):
complete the square
OpenStudy (tkhunny):
This is how I do it. I start by making it look like it needs to look when I'm done. f(x) = 2(x^2 + 4x + ______) + 12 - 2(______) The two blanks are the same. With what number shall we fill them?
OpenStudy (anonymous):
2? don't we take half of the middle term?
OpenStudy (tkhunny):
2? No. Half the middle coefficient and then square it. 4/2 = 2 2^2 = 4 Put 4 in the two blanks and simplify.
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