Hi everyone

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

What is the value of 36x - 8y^{2 }when 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

#2**0 **

there is no = next to the 3 all it says is

36x - 8y^{2} when 3 and y =-6

so i guess its like that

Guest Oct 14, 2018

#4**+1 **

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**+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**+1 **

OK let's get started!

36x - 8y^{2} 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

#7**-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