Polynomials,
NCERT Solutions for Class 9 Maths Chapter 2
Important NCERT Questions
Polynomials
NCERT Books for Session 2022-2023
CBSE Board and UP Board Others state Board
EXERCISE 2.5
Page No:48
Questions No:1 part:3
Use suitable identities to find the following products: (3x + 4) (3x – 5)
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(iii) (3x + 4)(3x – 5)
= (3x)² + (4 – 5)3x + 4 × (-5) [∵ (x + a)(x + b) = x² + (a + b)x + ab ]
= 9x² – 3x – 20