By using identity solve 98.2 × 100.2
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(98+.2)(100+.2)
(x+a)(x+b)=x^2+x(a+b)+ab
(.2+98)(.2+100)
.04+.2(98+100)+98*100
.04+396+9800
10196.04
(x+a)(x+b)=x^2+x(a+b)+ab
(.2+98)(.2+100)
.04+.2(98+100)+98*100
.04+396+9800
10196.04
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