Question

Please some Help me her.. I forgot how to do it..

Answer 1

Use the distance formula.
\[d = \sqrt{(x_{1} - x_{2})^{2} + (y_{1} - y_{2})^{2}}\]

Answer 2

I agree with @Calcmathlete , and if that looks kind of familiar it's because it comes from the Pythagorean Theorem: A\(^2\) + B\(^2\) = C\(^2\)

:-)

Chose two corners/vertices, in this case A & C, they each have an x & y coord

Answer 3

I got 9.06
is that right??

Answer 4

@agentx5 What did you get? I got a different answer, so I'm just making sure since I'm using a new calculator.

Answer 5

wait so my answer is wrong?

Answer 6

\[\sqrt{((-5)-(4))^2+((3)-(-2))^2}=\sqrt{106} \approx 10.29563\]

Answer 7

Yup. That's what I got.

Answer 8

I was going from A to C

Answer 9

The trick here isn't which way you go though, the trick is you MUST put parenthesis around what you substitute, always. It's true in what you're learning now @Trexy , it's true in my Calculus I'm doing, and it's the #1 simple syntax error I see on this website.

Why does it matter so much?

example:
1-1=0
1-(-1)=1+1=2

Answer 10

Hope that makes sense :-)

Answer 11

@Trexy try it with carefully substituting, any variable you replace gets ( ) around it. See if you get what we got? :-)

Answer 12

Here's another instance where no parentheses can mess you up. One of the biggest errors ever...
5 - 3^2 = ? A lot of people tend to get 14 when it's actually -4...
Although it's not substitution, a good example nonetheless

Answer 13

ooh ok.. I messed up putting it
so I did was like


but thank you so much @agentx5 and @Calcmathlete