+0  
 
+1
179
3
avatar+1405 

Help Me Please.

 

Radicals Equation. Solve for x.

 

√x2+9 +3= x+4

 Feb 27, 2018

Best Answer 

 #3
avatar+16319 
+2

you can just use parentheses like this

(x^2+9)       or use the  LaTex function...

\(\sqrt{x^2+9}\)   + 3   = x+4      simplify by subtracting 3 from both sides of the equation

 

sqrt(x^2+9) = x+1        Now square both sides

x^2 + 9  = (x+1)^2       Now expand the R side

x^2 + 9 = x^2 + 2x +1  Subtract x^2 from both sides

9 = 2x+1 

8=2x

x=4

 Feb 27, 2018
 #1
avatar+16319 
+1

Is ONLY x^2 under the radical sign?

 Feb 27, 2018
 #2
avatar+1405 
+1

no it also extends to the +9..I just dont know how to extend it can you tell me?

 Feb 27, 2018
 #3
avatar+16319 
+2
Best Answer

you can just use parentheses like this

(x^2+9)       or use the  LaTex function...

\(\sqrt{x^2+9}\)   + 3   = x+4      simplify by subtracting 3 from both sides of the equation

 

sqrt(x^2+9) = x+1        Now square both sides

x^2 + 9  = (x+1)^2       Now expand the R side

x^2 + 9 = x^2 + 2x +1  Subtract x^2 from both sides

9 = 2x+1 

8=2x

x=4

ElectricPavlov  Feb 27, 2018

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