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anonymous
 one year ago
Write the quadratic function in vertex form.
y = x2 + 8x + 18
anonymous
 one year ago
Write the quadratic function in vertex form. y = x2 + 8x + 18

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i know you have to Subtract 18 from both sides: y  18 = x^2 + 8x Complete the square by adding 16 to both sides: y  18 + 16 = x^2 + 8x + 16 y  2 = x^2 + 8x + 16 Express x^2 + 8x + 16 in binomial square form: y  2 = (x + 4)^2 Add 2 to both sides: y = (x + 4)^2 + 2

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0You can use the vertex formula to figure out the max height: t=−b2a t=−6402(−16) t=20 Next you'll need to insert t = 20 into the given equation: h(20) =  16(20)^2 + 640(20)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0then simplify the expression on the right to solve for h(20)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0how would you solve for h(20)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0h(20) =  16(20)^2 + 640(20)

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0how did it turn from t into h?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i have no idea im using this

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0http://openstudy.com/study#/updates/52586ec2e4b0ede9e4480f8b

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok the general form of a parabola looks like this \[x^2=4py\] and the standard forms are the messy quadratic equations

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0like that graph right?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[x^2+8x+18=0\]since you cant factorize this you need to complete the square\[x^2+8x=18\]\[x^2+8x+(\frac{ 8 }{ 2 })^2=18+(\frac{ 8 }{ 2 })^2\]\[x^2+8x+16=18+16\]\[(x+4)^2=2\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0dont worry about that graph thing yet

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0you can understand it so far?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0that means you dont understand...

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0would it be  instead of the +

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[(x+4)^2=2\]\[(x+4)^2+2=0\]
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