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Factorisation — MATHEMATICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9MATHEMATICSFactorisation2 Marks
Question
Factorise$ : 9x^2+ 3x - 8y - 64y^2$Factorise$ : 9x^2+ 3x - 8y - 64y^2$
✓

Answer

$9x^2+ 3x - 8y - 64y^2$
$= 9x^2 - 64y^2 + 3x - 8y$
$= [ (3x)^2 - (8y)^2 ] + ( 3x - 8y )$
$= [( 3x + 8y )( 3x - 8y )] + ( 3x - 8y )$
$= ( 3x - 8y )( 3x + 8y + 1 )$

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