+0

+1
276
3
+1451

√x2+9 +3= x+4

Feb 27, 2018

#3
+20217
0

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
+20217
0

Is ONLY x^2 under the radical sign?

Feb 27, 2018
#2
+1451
+1

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

Feb 27, 2018
#3
+20217
0

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