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Algebraic Expressions and Identities — MATHS STD 8 — Question

Gujarat BoardEnglish MediumSTD 8MATHSAlgebraic Expressions and Identities1 Mark
Question
Find the product: $(x + 7y)(7x - y)$
✓

Answer

$(x + 7y)(7x - y)$
$= x(7x - y) + 7y (7x - y)$
$= x \times 7x - x \times y + 7y \times 7x - 7y \times y$
$= 7x^2- xy + 49xy - 7y^2$
$= 7x^2+ 48xy - 7y^2$

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