ICSE Class 8 Answered
evaluate using expansion of (a+b)2 or (a-b)2.
(415)2
(188)2
(9.4)2
(20.7)2
Asked by rainikita525 | 08 Apr, 2020, 11:07: AM
Expert Answer
(415)2
= (400+15)2
= (400)2 + 2 x 400 x 15 + (15)2
= 160000 + 12000 + 225
= 172225
(188)2
= (200 - 12)2
= (200)2 - 2 x 200 x 12 + (12)2
= 40000 - 4800 + 144
= 40144 - 4800
= 35344
(9.4)2
= (9 + 0.4)2
= 92 + 2 x 9 x 0.4 + (0.4)2
= 81 + 7.2 + 0.16
= 88.36
(20.7)2
= (20 + 0.7)2
= (20)2 + 2 x 20 x 0.7 + (0.7)2
= 400 + 28 + 0.49
= 428.49
Answered by Renu Varma | 08 Apr, 2020, 11:23: AM
Concept Videos
-
Identities
Algebraic Identities, Identities -
Identities
Algebraic Identities, Identities
ICSE 8 - Maths
Asked by reddyking103 | 12 Mar, 2022, 03:25: PM
ANSWERED BY EXPERTICSE 8 - Maths
Asked by priyankakumari63777 | 05 Oct, 2021, 08:57: AM
ANSWERED BY EXPERTICSE 8 - Maths
Asked by johndoetrash | 24 Jan, 2021, 11:58: AM
ANSWERED BY EXPERTICSE 8 - Maths
Asked by ndwivedi167 | 24 Aug, 2020, 03:46: PM
ANSWERED BY EXPERTICSE 8 - Maths
Asked by rainikita525 | 14 May, 2020, 06:24: PM
ANSWERED BY EXPERTICSE 8 - Maths
Asked by rainikita525 | 08 Apr, 2020, 12:32: PM
ANSWERED BY EXPERTICSE 8 - Maths
Asked by rainikita525 | 08 Apr, 2020, 11:07: AM
ANSWERED BY EXPERT