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my teacher wants me to use this formula: x2+(a+b)x+ab

I don't understand. 

 

Please use this formula with this expression:  (\(\sqrt[2]{3}+2)(\sqrt[2]{3}+1)\)

Guest Mar 28, 2017
 #1
avatar+7154 
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The 2's indicating that it is the second root are assumed when not written.

\((\sqrt{3}+2)(\sqrt{3}+1)\)

 

x = √3

a = 1

b = 2

 

Substitute x, a, and b, into x2+(a+b)x+ab .

\((\sqrt{3})^2+(1+2)(\sqrt3)+(1)(2)\)

 

Simplify.

\(3+3\sqrt3+2 \\ 5+3\sqrt3\)

hectictar  Mar 29, 2017

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