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Expansions — MATHEMATICS STD 9 — Question

ICSE BoardEnglish MediumSTD 9MATHEMATICSExpansions3 Marks
Question
Simplify:$(3a - 7b + 3)(3a - 7b + 5)$
✓

Answer

$(3a - 7b + 3)(3a - 7b + 5)$
$= 3a(3a - 7b + 5) -7b (3a - 7b + 5) + 3(3a - 7b + 5)$
$= 9a^2 - 21ab + 15a - 21ab + 49b^2 - 35b + 9a - 21b + 15$
$= 9a^2 - 42ab + 24a + 49b^2 - 56b + 15.$

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