# quadratic expressions

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• Oct 7th 2011, 06:27 AM
andyboy179
quadratic expressions
hi,

i have to work this out, its a quadratic equation:

x^2+8x+16=0
would the brackets be - (x+4) (x+4) because 4x4=16 and 4+4=8???

thanks
• Oct 7th 2011, 07:05 AM
Siron
Re: quadratic expressions
Indeed:
$x^2+8x+16=0 \Leftrightarrow (x+4)(x+4)=0 \Leftrightarrow (x+4)^2=0$
• Oct 7th 2011, 04:12 PM
mr fantastic
Re: quadratic expressions
Quote:

Originally Posted by andyboy179
hi,

i have to work this out, its a quadratic equation:

x^2+8x+16=0
would the brackets be - (x+4) (x+4) because 4x4=16 and 4+4=8???

thanks

Can't you check your answer yourself simply by expanding it!?

(I noticed that you've started studying calculus. Fact: Algebraic competency - eg. doing things like what I have suggested - will be expectd and assumed by your teacher).