Question

use (x+a)(x+b)=x²+(a+b)x+ab,find 101×102​

Answer 1

Answer:

(100+1) (100+2)

100² + (1+2)100 +1×2

10000+ 300+ 2

10302

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Answer 2

ANSWER

103 × 104 = (100 +3) (100 + 4)

= (100)² + (3 + 4) (100) + (3) (4)

= 1000 + 700 + 12 = 10712