Question

Ujalakhan01 please help! What's (x+1)(x-1)?

Answer 1

x^2-2x+1

Explanation:

We can solve this by using FOIL

First, Outside, Inside, Last

Multiply the x with the x to get x^2

Then x times -1 for the outside numbers to get -x

Then -1 times x for the inside numbers to get -x

And finally -1 and -1 for the last numbers to get 1

Add the two -x to get -2x.

Put it all together

x^2-2x+1

Answer 2

`x^2-1`

Explanation:

=> (x+1)(x-1)

USING FOIL to solve the brackets

=>
`x^2+x-x-1`

=>
`x^2-1`