expand and simplify (x+1)(x-1)

first begin by expanding the brackets using the CLAW method (shown using whiteboard diagram)multiply the first of each bracket together, we get x²multiply the first term of the first bracket and the second term of the second bracket, we get -xmultiply the second term of the first bracket and the first term of the second bracket, we get +xmultiply the second term of each bracket, we get -1therefore, we have x² - x + x -1simplifying we get x² - 1this is called the difference of 2 squares