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Maths CBSE Live product
Class 9 (2026-27)
Exploring Algebraic Identities
Special Identities
8.
Evaluate the product
Question:
5
m.
Find the following product without multiplying directly:
\(23 \times 17\)
Ans
:
23
=
i
+
i
17
=
i
−
i
Identity used
:
(a - b)² = a² - 2ab + b²
(a + b)(a - b) = a² + b²
(a + b)(a - b) = a² - b²
(a + b)² = a² + 2ab + b²
23
×
17
=
i
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