(100+4)(100+5)
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(x+a)(x+b)= x^2+(a+b)x+a×b
here x=100 ,a=4 ,b=5
(100)^2+ (4+5)×100 +4×5
10000+900+20
10920.
here x=100 ,a=4 ,b=5
(100)^2+ (4+5)×100 +4×5
10000+900+20
10920.
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