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Expansions (Including Substitution) — MATHEMATICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9MATHEMATICSExpansions (Including Substitution)1 Mark
Question
Expand : $( 5x - 3y - 2 )^2$
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Answer

$( 5x - 3y - 2 )^2$
$= (5x)^2 + (3y)^2 + (2)^2 - 2(5x)(3y) + 2(3y)(2) - 2(2)(5x)$
$= 25x^2 + 9y^2 + 4 - 30xy + 12y - 20x$

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