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Ex 12.3, 3 - Chapter 12 Class 7 Algebraic Expressions
Last updated at March 23, 2023 by Teachoo
Ex 12.3
Ex 12.3, 1
Ex 12.3, 2 Important
Ex 12.3, 3 You are here
Ex 12.3, 4
Ex 12.3, 5 Important
Ex 12.3, 6 (i)
Ex 12.3, 6 (ii) Important
Ex 12.3, 6 (iii)
Ex 12.3, 6 (iv) Important
Ex 12.3, 7 (i) Important
Ex 12.3, 7 (ii)
Ex 12.3, 7 (iii) Important
Ex 12.3, 7 (iv)
Ex 12.3, 7 (v) Important
Ex 12.3, 8 (i)
Ex 12.3, 8 (ii) Important
Ex 12.3, 9 Important
Ex 12.3, 10
Transcript
Ex 12.3, 3 Find the value of the following expressions, when x = –1: (i) 2x – 7 2x − 7 Putting x = − 1 = 2 (−1) − 7 = −2 − 7 = −9 Ex 12.3, 3 Find the value of the following expressions, when x = –1: (ii) – x + 2 −x + 2 Putting x = −1 = − (−1) + 2 = 1 + 2 = 3 Ex 12.3, 3 Find the value of the following expressions, when x = –1: (iii) x2 + 2x + 1 x2 + 2x + 1 Putting x = −1 = (−1)2 + 2(−1) + 1 = 1 – 2 + 1 = 2 − 2 = 0 Ex 12.3, 3 Find the value of the following expressions, when x = –1: (iv) 2x2 – x – 2 2x2 – x – 2 Putting x = −1 = 2(−1)2 − (−1) −2 = 2(1) + 1 − 2 = 3 – 2 = 1
