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Fundamental Concepts (Including Fundamental Operations) — MATHS STD 7 — Question

ICSE BoardEnglish MediumSTD 7MATHSFundamental Concepts (Including Fundamental Operations)3 Marks
Question
Subtract: $2 x^2-7 x y-y^2$ from $3 x^2-5 x y+3 y^2$
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Answer

$2 x^2-7 x y-y^2$ from $3 x^2-5 x y+3 y^2$​​​​​​​
$= (3x^2 - 5xy + 3y^2) - (2x^2 - 7xy - y^2)$
$= 3x^2 - 5xy + 3y^2 - 2x^2 + 7xy + y^2$
$= 3x^2 - 2x^2 - 5xy + 7xy + 3y^2 + y^2$
$= x^2 + 2xy + 4y^2​​​​​​​$​​​​​​​

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