Question

Find the value using identity: 97x 105.

Answer 1

a square minus b square

Answer 2

(x+a) (x+b)=
${x}^{2} + (a + b)x + ab$
(100+5 ) ( 100 - 3)

1002 + ( 5 - 3 ) 100 + 5 x - 3

10000 + 200 + -15

10200 - 15

10158