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Maths CBSE Live product
Class 9 (2026-27)
Exploring Algebraic Identities
Algebraic Identities
8.
Area of the remaining cardboard
Question:
5
m.
A square cardboard has side
40
\(cm\). A strip of width \(5 \ cm\) is removed from each side. Find the area of the remaining square using the identity.
Ans
:
Remaining area \(=\)
\(sq. cm\)
Identity used:
a² - b² = (a - b)(a + b)
(a + b)² = a² + 2ab + b²
(a + b)³ = a³ + 3a²b + 3ab² + b³
(a - b)² = a² - 2ab + b²
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