+0  
 
-1
109
1
avatar

Given \( \delta(x) = 3x + 8\) and \( \phi(x) = 8x + 7\), what is \(x\) if \( \delta(\phi(x)) = 7\)?

Guest Feb 10, 2018
 #1
avatar+86935 
+2

δ (x)  = 3x + 8       Φ(x)  =  8x + 7

 

So

 

δ ( Φ (x) )  =  7        means that

 

3 [ 8x + 7 ]  +  8   =  7

 

24x + 21  +  8  =  7

 

24x + 29  = 7    subtract  29 from both sides

 

24x  =  -22       divide both sides by  24

 

x  = -22 / 24   =   - 11  / 12

 

 

 

cool cool cool

CPhill  Feb 10, 2018

12 Online Users

avatar

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.