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July 29, 2014

July 29, 2014

Posted by **ashley** on Friday, May 28, 2010 at 8:08pm.

(X+4)^2=6

could you help me please.

- alegbra -
**bobpursley**, Friday, May 28, 2010 at 9:32pmIf I only knew what the question was. Is there an equal sign on the first?

- alegbra -
**Damon**, Friday, May 28, 2010 at 9:56pmThat trinomial is not a perfect square.

- alegbra -
**Damon**, Friday, May 28, 2010 at 10:04pmYou can easily figure out if a trinomial is a perfect square.

x^2 + b x + c

if c = (b/2)^2

then

it factors to

(x + b/2 )^2

for example

(x + 3)^2 = x^2 + 6 x + 9

note that

9 = (6/2)^2

so if you were given

x^2 + 6 x + 9

you would do

(6/2)^2 which is 3^2 which is 9

so sure enought it is a perfect square

however if you are given

x^2 + 4 x - 8

(4/2)^2 = 2 ^2 = 4

which is NOT - 8 so it is not what you want

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