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Solving a Quadratic Equation by Completion of Squares Method

Solve 3[ 18...

Question

Solve $3 [18 - {3 + 4 (4 - 2)}]$

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Solution

$3 [18 - {3 + 4 (4 - 2)}]$
$= 3 [18 - {3 + 4 \times 2}]$
$= 3 [{18 - 11}]$
$= 3 [7]$
$= 21$

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