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Hi everyone 

 

Is there someone who can maybe assist me with this question.

 

What is the value of 36x - 8ywhen 3 and y = -6 

 

 I looked the answer up , but still dont understand how to get to the answer eventhough I tried to follow the steps that was given with the answer.

 

 Hope someone can  assist me . would be much appriciated...

 
Guest Oct 14, 2018
 #1
avatar+566 
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Do you mean when 3=x and y=-6?

 
SmartMathMan  Oct 14, 2018
 #2
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there is no = next to the 3 all it says is  

 

36x - 8y2  when 3 and y =-6 

 

so i guess its like that

 
Guest Oct 14, 2018
 #3
avatar+566 
-1

36x- 8y² = 36·3 - 8·(-6)² 
= 108 - 8·36 
= -180 

 

I hope that helped

 
SmartMathMan  Oct 14, 2018
 #4
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36x- 8y² = 36·3 - 8·(-6)² 
= 108 - 8·36 
= -180 

 

How did you work it out though 

 

Do you take 108 - 8 x 36 ? sorry I'm just trying to figure out how you get the answer so i can understand it better

 
Guest Oct 14, 2018
 #5
avatar+189 
+1

First thing you do is input 3 into x(if 3 is x the question doesnt make sense) and -6 into y 

 36x - 8y^2

36(3)-8(-6)^2

108-8(36)

108-288

the answer would then = -108 

 
Baneofwizard  Oct 14, 2018
 #6
avatar+443 
+1

OK let's get started!

 

36x - 8y2    Where 3= x and y= -6.

 

36x- 8y² = 36·3 - 8·(-6)² 
= 108 - 8·36 } Here you multiply 8*36 before you subtract according to PEMDAS. 

= 108 - 288

= -180
 

 

Hope this clears things up! Don't hesitate to ask more questions here on the forum!

 
Mr.Owl  Oct 14, 2018
edited by Mr.Owl  Oct 14, 2018
edited by Mr.Owl  Oct 14, 2018
 #7
avatar+566 
-1

Mr. Owl is wrong. Three people got the same answer but he got a random answer. Only answer if you know you have done the problem correctly. 

 
SmartMathMan  Oct 14, 2018
 #8
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0

But he got the same answer as you... and only 3 users answered this question...

 
Guest Oct 14, 2018

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