Question

Using (x+a)(x+b)=x2+(a+b)+ab, find
1) 103x104

Answer 1

Answer:

(100+3)(100+4)= 100*2+(3+4)+3×4

= 10000+7+12

= 10019

Answer 2

Answer:

103×104

(100+3)(100+4)

100^2 +(4+3)100 +4×3

10000+700+12

10712