Question

I know the answer for this but please answer step by step and tell me how you got to the 4s.
Question: (2x-1)² - (x-1) (x+1)
Answer: 4x² - 4x + 1 - (x² - 1)
4x² - 4x + 1- x²-1
3x² - 4x + 2​

Answer 1

Answer:

x times x=2x

then 2x times the 2x = 4x

Step-by-step explanation:

I guess

Answer 2

Answer:

Okay then, you see first (2x-1)² you can expand it by using (a-b)² = a² - 2ab + b².

(x-1)(x+l) can be factorised using (a-b)(a+) = a²-b².

Next, expand and factories accordingly...

you will get .. 4x² - 4x + 1 - (x² - 1)

Got it?

Now open the brackets, and it will be like this.. 4x² - 4x + 1 - x² + 1.

Now, group and add/subtract the like terms... you will get 3x² - 4x + 2.

Hope you understood now! It's pretty simple!