We need to expand the expression $(x+8)(x-1)$.

1. Problem Description

We need to expand the expression $(x+8)(x-1)$.

2. Solution Steps

We use the distributive property (also known as the FOIL method) to expand the expression:

$(x+8)(x-1) = x(x-1) + 8(x-1)$.

Now, distribute $x$ and $8$:

$x(x-1) = x^2 - x$

$8(x-1) = 8x - 8$

So, we have:

$(x+8)(x-1) = x^2 - x + 8x - 8$

Combine like terms:

$-x + 8x = 7x$

Therefore,

$(x+8)(x-1) = x^2 + 7x - 8$

3. Final Answer

$x^2 + 7x - 8$