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+1
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avatar+97 

x^2 -10 = 15

Help me solve algebraically.

 Feb 14, 2019
 #1
avatar+12 
+2

+10 on both sides

so it would be x^2=25

sqrt(25)= x

x= 5 

 Feb 14, 2019
 #2
avatar+98090 
+1

Here's another way

 

x^2 - 10 = 15       subtract 15 from both sides

 

x^2 - 25 =  0         factor  as a difference of squares

 

(x - 5)  (x + 5) =  0        set each factor to 0 and solve for x and we get that

 

x = 5     or    x  =  -5

 

 

cool cool cool

 Feb 14, 2019

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