1. Show that
(10a + 5)^2 = 100a(a + 1) + 25,
for every a real number. How is this formula exp...
![subject](/tpl/images/cats/mat.png)
Mathematics, 14.02.2021 23:40 wolfycatsz74
1. Show that
(10a + 5)^2 = 100a(a + 1) + 25,
for every a real number. How is this formula explaining the rule we have, to square a number
which ends in 5, such as
25^2 = 625, 35^3 = 1225, 105^2 = 11025^2, etc. ?
![ansver](/tpl/images/cats/User.png)
Answers: 3
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Mathematics
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 16:10
Pls! does anybody know a shortcut for answering these types of questions in the future?
Answers: 3
![question](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 23:00
Peter measures the angles in a triangle. he finds that the angles are 95, 10 and 75. is he correct? explain your answer
Answers: 2
![question](/tpl/images/cats/mat.png)
You know the right answer?
Questions
![question](/tpl/images/cats/obshestvoznanie.png)
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 12.04.2021 22:40
![question](/tpl/images/cats/ekonomika.png)
![question](/tpl/images/cats/istoriya.png)
History, 12.04.2021 22:40
![question](/tpl/images/cats/himiya.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 12.04.2021 22:40
![question](/tpl/images/cats/istoriya.png)
History, 12.04.2021 22:40
![question](/tpl/images/cats/mat.png)
Mathematics, 12.04.2021 22:40
![question](/tpl/images/cats/istoriya.png)
History, 12.04.2021 22:40
![question](/tpl/images/cats/mat.png)
Mathematics, 12.04.2021 22:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 12.04.2021 22:40
![question](/tpl/images/cats/en.png)
English, 12.04.2021 22:40
![question](/tpl/images/cats/istoriya.png)
History, 12.04.2021 22:40
![question](/tpl/images/cats/istoriya.png)
History, 12.04.2021 22:40
![question](/tpl/images/cats/mkx.png)
![question](/tpl/images/cats/mat.png)
Mathematics, 12.04.2021 22:40
![question](/tpl/images/cats/mat.png)
Mathematics, 12.04.2021 22:40
![question](/tpl/images/cats/en.png)
English, 12.04.2021 22:40