please solve thise class 9 matg ch 2
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q.1We solve the given expression (3x−2y+5z) 2 as shown below:
(3x−2y+5z)2
(∵(a+b+c) 2 =a 2 +b 2 +c 2 +2ab+2bc+2ca)
=9x
2 +4y 2 +25z 2 −12xy−20yz+30zx
Hence, (3x−2y+5z) 2
=9x 2 +4y 2+25z 2 −12xy−20yz+30zx.
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