Meena S. answered 11/11/17
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(a2 +3a-7)(2a2 -a+4)
=a2 (2a2 -a +4) +3a(2a2 -a+4)-7(2a2 -a+4)
=2a4 -a3 +4a2 +6a3-3a2 +12a -14a2 +7a-28
=2a4+5a3-13a2+19a-28