Question

Using suitable identity evaluate, 103 x 98.​

Answer 1

Answer:

103 * 98=( 100+3) (100-2) = 100square + 3* 100 - 100 * 2-3 *2

=10000+300-200-6

= 10094

We use identity : (A+B) (A-C) = A^ 2 + AB - AC - BC

103 * 98 = (102+1) * 98 = 102 * 98 + 98

= (100+2) (100-2) + 98

= 100 square - 2 square + 98

= 10094.