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Expansions — MATHEMATICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9MATHEMATICSExpansions2 Marks
Question
Expand the following$:(3x + 4) (2x - 1)$
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Answer

$(3x + 4) (2x - 1)$
$= 6x^2- 3x + 8x - 4$
$= 6x^2 + 5x - 4$
Using identity : $(x+ a) (x -b)$
$= x^2 + (a - b) x - ab).$

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