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avatar+1405 

Help Me please!!

 

Word problem

 

When 5 is added to a certain number, and also taken from that number, the product of the result is 75. find that number

 Mar 1, 2018
 #1
avatar+27664 
+2

Let x be the number. Then:

 

(x-5)(x+5) = 75

 

x2 - 25 = 75

 

x2 = 100

 

x = 10.  

 

(x = -10 is also a solution)

 Mar 1, 2018
 #2
avatar
0

sorry don't understand "the product of the result is 75".to have a product you need at least 2 numbers

 Mar 1, 2018
 #3
avatar+18057 
+2

(x-5)   *   (x+5)       are the two numbers multiplied together,,...... 

ElectricPavlov  Mar 1, 2018
 #4
avatar+99586 
+1

Alan is correct....

 

if x  = 10  ⇒   (10 + 5) (10 - 5)   =  15 * 5   =  75

 

If x  =  -10  ⇒  (-10 + 5)  (-10 - 5)  =  -5 * -15   =  75

 

 

cool cool cool

 Mar 1, 2018
 #5
avatar+1405 
+1

Thank you alllaugh

 Mar 1, 2018

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