Question

if, then
$if 1 - x + x ^{2} = 0 then 18 + x {3} + x {6} + x {9} + x {12} + x {15} + x {8} =$
​

Answer 1

Step-by-step explanation:

if, then

$if 1 - x + x ^{2} = 0 then 18 + x {3} + x {6} + x {9} + x {12} + x {15} + x {8} =$