Expand the following using suitable identities. I want with explanation please
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(I) {(3x)sq+(2y)sq+2.3x.2y} + {(3x)sq+(2y)sq-2.3x.2y}
or, {9x2+4y2+12xy}+{9x2+4y2-12xy}
or 18xsq+8y2
(ii)(9xsq+4ysq+12xy)-(9xsq+4ysq-12xy)
or,24xy
or, {9x2+4y2+12xy}+{9x2+4y2-12xy}
or 18xsq+8y2
(ii)(9xsq+4ysq+12xy)-(9xsq+4ysq-12xy)
or,24xy
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