CBSE Class 9 Answered
Asked by kishor.kp14 | 26 Jun, 2019, 04:20: PM
Expert Answer
We kow that,
(a + b + c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ac
1) (x + y + z)2 + (x + y - z)2
= x2 + y2 + z2 + 2xy + 2yz + 2xz + x2 + y2 + z2 + 2xy - 2yz - 2xz
= 2x2 + 2y2 + 2z2 + 4xy
= 2(x2 + y2 + z2 + 2xy)
2) (2x + p - c)2 - (2x - p + c)2
= (2x)2 + p2 + (-c)2 + 4xp - 2pc - 4xc - [(2x)2 + (-p)2 + c2 - 4xp - 2pc + 4xc)
= 4x2 + p2 + c2 + 4xp - 2pc - 4xc - 4x2 - p2 - c2 + 4xp + 2pc - 4xc
= 8xp - 8cx
= 8x(p - c)
Answered by Yasmeen Khan | 26 Jun, 2019, 05:31: PM
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