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Equations: solve by completing the square

 

x2-10x=56

 Feb 28, 2018

6+0 Answers

 #1
avatar+37146 
+1

x^2 -10x =56     take 1/2  the 'b' coefficient  (-10)     square it and add it to both sides of the equation

x^2 -10x + 25 = 56 +25   now you can do this:

(x-5)^2  = 81

 

Now  x-5 = +- 9

          x = 14   or -4  

 Feb 28, 2018
 #2
avatar+1495 
+1

so both answer will count? or I need to put one of them?

 Feb 28, 2018
 #3
avatar+37146 
0

Both answers are correct......   substitute them into the original equation to see !   cheeky

ElectricPavlov  Feb 28, 2018
 #5
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0

I do wonder at the marvels of the sub-human brain. How did you ever figured out logging on to the forum?  Someone must have showed you several dozen times. I’m sure that’s how the other retardos learned.

Guest Feb 28, 2018
 #6
avatar+1495 
0

so you are calling me retardo?

 Feb 28, 2018
 #7
avatar
0

Oh no, of course not, Manuel, what would make you think that?

Guest Feb 28, 2018

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