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Identities — MATHS STD 8 — Question

ICSE BoardEnglish MediumSTD 8MATHSIdentities4 Marks
Question
Use the direct method to evaluate the following products : $(y + 5)(y – 3)$
✓

Answer

$(y + 5) (y – 3) $
$= (y \times y) + (y \times −3) + (5 \times y) + (5 \times −3)$
$= y^2 + (−3y) + (5y) − 15$
$= y^2− 3y + 5y − 15$
$= y^2 + 2y − 15$

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