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math doubts [NEW]

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Ghost Of Highbury:
x^2 + 6x = 9 - (x-3)^2

therefore a = 9
             b = 3

zara:

--- Quote from: eddie_adi619 on September 26, 2009, 06:00:48 pm ---x^2 + 6x = 9 - (x-3)^2

therefore a = 9
             b = 3

--- End quote ---
im lost adi..:\
i need the steps if possible?!

Ghost Of Highbury:
the general rule

x2 + nx = (x + n/2)2 - (n/2)2

n = 6

therefore n/2 = 3

here its  -x2 + 6x = (x-3)2 - (3)2 = -x2 + 6x = 9 - (x-3)2

Ghost Of Highbury:
did u get g(f(x)) = -3x2 +18x - 2????

astarmathsandphysics:

--- Quote from: eddie_adi619 on September 26, 2009, 06:17:04 pm ---the general rule

x2 + nx = (x + n/2)2 - (n/2)2

n = 6

therefore n/2 = 3

here its  -x2 + 6x = (x-3)2 - (3)2 = -x2 + 6x = (x-3)2 - 9



--- End quote ---

Should be (x+3)2-9

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