Question

How do you foil `( x+8) (x - 8)`?

Answer 1

`=color(blue)(x^2-64`

Explanation:

The expression is :`(x+8)(x-8)`

F O I L involves carrying out the below operations in the following order:

1) product of First terms :`(color(blue)(x and x))`+

2)product of Outside terms:`(color(blue)(x and -8))`+

3)product of Inside terms:`(color(blue)(8 and x))`+

4)product of Last terms:`(color(blue)(8 and -8))`

1) `x *x=color(blue)(x^2) +`

2) `x * -8=-color(blue)(8x)+`

3) `8 * x = color(blue)(8x)+`

4) `8 *-8 = color(blue)(-64`

adding all the terms

`=color(blue)(x^2-8x +8x -64`
`=color(blue)(x^2-64`