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Property 7

Solve: d2 -...

Question

Solve: $d^{2} - 4 d - 45$

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Solution

$d^{2} - 4 d - 45$
$= d^{2} - 9 d + 5 d - 45$
$= d (d - 9) + 5 (d - 9)$
$= (d - 9) (d + 5)$
$∴ d^{2} - 4 d - 45 = (d - 9) (d + 5)$ .

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