Question

Evaluate ( using properties) 98 × 102​

Answer 1

Answer:

(100-2) × (100+2)

The property is (a+b) (a-b)= a( square) - b (square)

a=100, b=2

(100) square - (2) square

10000 - 4

9996

It is the correct answer..

Answer 2

98 = 100 - 2

102 =100 + 2

= (100 - 2)(100 + 2) ............. (a+b × a-b =

${a}^{2} - {b}^{2}$

a= 100

b= 2

${100}^{2} = 10000 \\ {2}^{2} = 4$

=10000 - 4

= 9996