multiply : (a+5) by (a+4)
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(a+5)(a+4)
a(a+4)+5(a+4)
a2 + 4a+5a+5*4
==> a2+9a+20
a(a+4)+5(a+4)
a2 + 4a+5a+5*4
==> a2+9a+20
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