![Mathematics](/tpl/images/cats/mat.png)
Mathematics, 16.02.2021 06:50, eggemotions
Alaina was asked whether the following equation is an identity:
(2x + 1)2 – (x + 1)2 = 3(x + 1)2 - 1
She performed the following steps:
(2x + 1)2 – (x + 1)2
Step 1
= 4x2 + 4x +1 - 2 + 2.0 + 1
Step 2
= 3x2 + 6x + 2
Step 3
→
= 3x² + 6x +3-1
Step
= 3(x2 + 2x + 1) - 1
Step 5
3(x + 1)2 – 1
For this reason, Alaina stated that the equation is a true identity.
Is Alaina correct? If not, in which step did she make a mistake?
![answer](/tpl/images/cats/otvet.png)
Answers: 3
Other questions on the subject: Mathematics
![image](/tpl/images/cats/mat.png)
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 18:30, mauralawson
Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =
Answers: 1
![image](/tpl/images/cats/mat.png)
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 19:30, taylor511176
Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?
Answers: 1
Do you know the correct answer?
Alaina was asked whether the following equation is an identity:
(2x + 1)2 – (x + 1)2 = 3(x + 1)2 -...
Questions in other subjects:
![Konu](/tpl/images/cats/en.png)
English, 15.07.2021 01:00
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/mat.png)
Mathematics, 15.07.2021 01:00
![Konu](/tpl/images/cats/himiya.png)
![Konu](/tpl/images/cats/istoriya.png)
![Konu](/tpl/images/cats/mat.png)
Mathematics, 15.07.2021 01:00
![Konu](/tpl/images/cats/mat.png)
Mathematics, 15.07.2021 01:00
![Konu](/tpl/images/cats/en.png)
![Konu](/tpl/images/cats/himiya.png)
![Konu](/tpl/images/cats/obshestvoznanie.png)
Social Studies, 15.07.2021 01:00