Question

How do you find the product `(z-1)(z-8)`?

Answer 1

`z^2-9z+8`

Explanation:

Given: `" "color(red)((z-1)color(green)((z-8))`

Multiply everything in the right brackets by everything in the left brackets.

`color(green)( color(red)(z)(z-8)" "color(red)(-1)(z-8) )`

`z^2 -8z" "-color(white)(.)z+8`

`z^2-9z+8`