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