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the product of my number and twice my number is 72. what is half my number?

off-topic
Guest Jul 14, 2017

Best Answer 

 #1
avatar+4480 
+2

Let's call the number  " n " .

 

The problem tells us that...

n * 2n  =  72

 

2n2  =  72              Divide both sides of this equation by  2  .

 

n2  =  36                Take the  ±  square root of both sides.

 

n  =  ±√36

 

n  =  ± 6

 

So..your number can be either  6  or  -6  .

 

Half of   6  is    3  .

Half of  -6  is  -3  .

hectictar  Jul 14, 2017
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2+0 Answers

 #1
avatar+4480 
+2
Best Answer

Let's call the number  " n " .

 

The problem tells us that...

n * 2n  =  72

 

2n2  =  72              Divide both sides of this equation by  2  .

 

n2  =  36                Take the  ±  square root of both sides.

 

n  =  ±√36

 

n  =  ± 6

 

So..your number can be either  6  or  -6  .

 

Half of   6  is    3  .

Half of  -6  is  -3  .

hectictar  Jul 14, 2017
 #2
avatar+353 
+1

I agree with hectiar

AsadRehman  Jul 14, 2017

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