Chapter 4
Exploring Algebraic Identities
CBSE Class 9
Mathematics Solutions
Educart Mathematics class Class 9 NCERT Exemplar cover
Question:

A rectangular pool has area 2x2+7x+32x^2 + 7x + 3 sq. hastas, if its width is (2x+1)(2x + 1) hastas. Find its length.
 Hasta was a unit used to measure length.

Answer: Verified

Factor 2x2+7x+32x^2 + 7x + 3.
Split 7x7x using factors of 66 into 6x+x6x + x.
  2x2+6x+x+3=2x(x+3)+1(x+3)=(2x+1)(x+3)2x^2 + 6x + x + 3 = 2x(x + 3) + 1(x + 3) = (2x + 1)(x + 3).
Length = (x+3)(x+3) hastas

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