Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 9th
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Expand the following: (−p + 2q + 3r)2 - Mathematics

Sum

Expand the following:

(−p + 2q + 3r)2

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Solution

(−p + 2q + 3r) 

(a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca

(−p + 2q + 3r)2 = (−p)2 + (2q)2 + (3r)2 + 2(−p)(2q) + 2(2q)(3r) + 2(−p)(3r)

= p2 + 4q2 + 9r2 – 4pq +12qr – 6rp

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APPEARS IN

Samacheer Kalvi Mathematics Class 9th Tamil Nadu State Board
Chapter 3 Algebra
Exercise 3.4 | Q 1. (ii) | Page 101
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