Question

b) 98x109
find using identity ​

Answer 1

98×109

=(100-2)×(100+9)

=100×(-2+9)

=100×7

=700

thanks for interesting question

Answer 2

Answer:

by using identity Vl

(x+a)(x+b)=x²+(a+b)x+ab

=(100-2)×(100+9)

=100²+(-2+3)×100+(-2)(3)

=10000-100-6

=10000-106

=9,894