Solve This In Just 3 Seconds!

[@nikolausmoll9201]

you have 3 seconds, but the video takes almost 3 minutes...

[@johnnyirish9852]

the video is the explanation. if you know the rule you just need seconds to calculate it.

[@wes9627]

I knew within 3 seconds how to solve the problem but it takes at least one minute to write down the answer.
(100+13)^2-(100-13)^2=4*13*100=5200

[@giuseppemalaguti435]

200*26=5200

[@rogerkearns8094]

Half a minute, maybe, including double-checking.
Btw, you mean simplify, not solve. I probably spent a second ot two searching for a variable.

[@andrewclifton9772]

Maybe 5 seconds but 5200.

[@vitorluis2010]

2 minutes or more

[@Mal1234567]

I don't like how you write your 4's.