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If y=x2-2x-3, then if y=1, what's x?

Guest Mar 18, 2017
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 #1
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actually i was going to go, but then i saw your question so thought to answer it ,

 

now , \(y=x^2 -2x - 3 \)

now y is also eqal to 1 so 

 

\(y=1\)

 

if we quate both of them then,

\(1=x^2 -2x -3 \)

 

Take 1 to the other side 

\(x^2 -2x-3-1=0\)

\(x^2 - 2x- 4 = 0\)

 

now it has turned into a simple quadratic equation that you can solve either by factirisation or by the quadratic formula!

 

smileylaughwink

rosala  Mar 18, 2017

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