I have to do step by step why the answer of (5x - 1) (5x - 1) is 25x^2 - 10x + 1. How do i do it?

(5x - 1) (5x - 1)

Ans: 25x^2 - 10x + 1

There’s 2 ways. One is simpler than the other; A normal bracket expansion we would do 5x * 5x which equals to 25x^2, then 5x * -1. Do the same with the second bracket: 5x * 5x = 25x^2. Then, 5x * -1 which is -5x
Now we have 25x^2 + -5x + 25x^2 -5x. Add like terms to get 50x^2 - 10x.
And the second method is using Pascals triangle but I’m not going to get much in detail as this is just a double extension bracket and all it will do is confuse you.