Check sibling questions

Ex 12.3, 2 - Chapter 12 Class 7 Algebraic Expressions

Last updated at March 23, 2023 by

Ex 12.3, 2 - If p = -2, find the value of (i) 4p + 7 (ii) -3p^2 + 4p

Ex 12.3, 2 - Chapter 12 Class 7 Algebraic Expressions - Part 2
Ex 12.3, 2 - Chapter 12 Class 7 Algebraic Expressions - Part 3

This video is only available for Teachoo black users

Subscribe Now

This video is only available for Teachoo black users

Subscribe Now

This video is only available for Teachoo black users

Subscribe Now

Get live Maths 1-on-1 Classs - Class 6 to 12

Book 30 minute class for ₹ 499 ₹ 299

Transcript

Ex 12.3, 2 If p = – 2, find the value of: (i) 4p + 7 4p + 7 Putting p = −2 = 4 (−2) + 7 = − 8 + 7 = −1 Ex 12.3, 2 If p = – 2, find the value of: (ii) – 3p2 + 4p + 7 – 3p2 + 4p + 7 Putting p = − 2 = −3 (−2)2 + 4 (−2) + 7 = −3 (4)2 − 8 + 7 = −3 × 4 − 8 + 7 = –12 – 1 = −13 Ex 12.3, 2 If p = – 2, find the value of: (iii) – 2p3 – 3p2 + 4p + 7 – 2p3 – 3p2 + 4p + 7 Putting p = −2 = −2 (−2)3 − 3 (−2)2 + 4 (−2) + 7 = −2 (−8) − 3 (4) − 8 + 7= = 16 − 12 − 1 = 4 − 1 = 3

Ask a doubt
Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.