Question
Factorise : Evaluate ${(999)^2 - 1}$
✓
Answer
${(999)^2 - 1}$
$= {(999)^2 - (1)^2}$
$= {(999 - 1)(999 + 1)}$
$= 998 \times 1000$
$= 998000$
$= {(999)^2 - (1)^2}$
$= {(999 - 1)(999 + 1)}$
$= 998 \times 1000$
$= 998000$
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