Question

What is (x-5) (x+5)?

Answer 1

`(x-5) (x+5)=x\cdot x+5\cdot x-5\cdot x-5\cdot5=x^2+5x-5x-25=\\ \\=x^2-25`

Answer 2

`(x-5)(x+5)\\FOIL\ Method\\\\First \\x*x=x^2\\\\Outside\\x*5=5x\\\\Inside\\-5*x=-5x\\\\Last\\-5*5=-25 \\\\ Combine\ like\ terms.\\\\-5x+5x=0x\\\\Combine\ together\\\\x^2-25`

Hope this helped :)