Al-Allo wrote:

are you people mathematicians or proffesors ?

I am a retired teacher (of maths). In French the word 'professeur' means teacher.

muxdemux wrote:

check that you typed the equation properly in your original post

You have a value for 'b' but it isn't used in the question. Maybe there should be a 'b' in it?

Bob

]]>Neither the exercise or me got it

Maybe... You might want to double check that you typed the equation properly in your original post. (Does your textbook really say

?)are you people mathematicians or proffesors

I'm just some guy from Australia lol. I'm studying at university right now, but I'm definitely not a professor! I'm not even studying to become a mathematician. Though math is needed in a lot of different subjects.

]]>bob

]]>You are asked to evaluate c^2 (amongst other things of course ... but let's just concentrate on that bit)

So evaluate -5 squared

I put in the bracket to explain why that becomes +25.

Try this on a calculator.

Enter 5, switch it to negative with the +/- button, and store it.

Then do memory recall and press the square button.

Bob

Yes, It's ok.

I understand that but it's just I had that memory which didn't seem to agree with you (Like you were distabilizing my foundations, but it's for my good )

]]>So evaluate -5 squared

I put in the bracket to explain why that becomes +25.

Try this on a calculator.

Enter 5, switch it to negative with the +/- button, and store it.

Then do memory recall and press the square button.

Bob

]]>are not the same thing.

Bob

]]>Why do you put-5 in to parantheses ?

it doesn't have any, -5^2 = -(5X5)=-25

How is this wrong ?

]]>Sorry muxdemux, I was wrong before. I do get the same as you.

I didn't follow your working though. I'm glad you explained where it came from.

Bob

]]>Sorry about my previous post. I subbed into the equivalent expression Wolfram Alpha came up with instead of the original. I don't see any reason the answer should be different though.

Why don't you show your working, Allo?

]]>And It gets also -64 And not -54 ....Any suggestions ?

]]>That's not what I'm getting???

Bob

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