We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive pseudonymised information about your use of our website. cookie policy and privacy policy.
 
+0  
 
+1
220
3
avatar+1432 

Help Me Please.

 

Radicals Equation. Solve for x.

 

√x2+9 +3= x+4

 Feb 27, 2018

Best Answer 

 #3
avatar+18332 
+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+18332 
+1

Is ONLY x^2 under the radical sign?

 Feb 27, 2018
 #2
avatar+1432 
+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+18332 
+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

12 Online Users

avatar
avatar
avatar