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

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Answer 1 · 2017-02-25T14:52:11

$z^2-9z+8$

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

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

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

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

$z^2-9z+8$

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