Question

Using (x+a)(x+b)=x²+(a+b)x+ab,find
5.1×5.2​

Answer 1

Answer:

5.1×5.2=(50)

=(5+0.1)×(5+0.2)

=52+5(0.1+0.2)+0.1×0.2

=25+1.5+0.02

=26.52