+0  
 
+5
187
1
avatar

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

Guest Nov 14, 2014

Best Answer 

 #1
avatar+81027 
+5

We have

3[8x + 7 ] + 8 = 7   simplify

24x + 21 + 8  = 7

24x + 29  = 7    subtract 29 from both sides

24x = -22         divide both sides by 24

x = -22/24 = -11/12

 

CPhill  Nov 14, 2014
Sort: 

1+0 Answers

 #1
avatar+81027 
+5
Best Answer

We have

3[8x + 7 ] + 8 = 7   simplify

24x + 21 + 8  = 7

24x + 29  = 7    subtract 29 from both sides

24x = -22         divide both sides by 24

x = -22/24 = -11/12

 

CPhill  Nov 14, 2014

19 Online Users

avatar
avatar
avatar
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details