Question

find the product using the identity (x+a)(x+b)=x^2+x(a+b)+ab:
(1.) 12×18
(2.) 104×103
(3.) 95×102
(4.) 198×209

Answer 1

Answer:

1. 12*18=10sq.+10(2+8)+2*8

=100+10*10+16

=100+100+16

=216

2.104*103=100sq.+100(4+3)+4*3

=10000+100*7+12

=10712