Question

Without multiplying actually, guess the product of:x + 5x2 and 3x + y​

Answer 1

Answer:

(i) 103×107

=(100+3)(100+7)

=(100)

2

+(3+7)(100)+(3)(7)

=10000+1000+21=11021

(ii) 95×96

=(90+5)(90+6)=(90)

2

+(5+6)(90)+(5)(6)

=8100+990+30=9120

(iii) 104×96

=(100+4)(100−4)

=(100)

2

−(4)

2

=10000−16=9984