Evaluate these using identity :102 × 98

1.	Evaluate these using identity :102 × 98
Answer» 102 × 98 = (100+ 2) (100 – 2) Identity (a + b)(a – b) = a² – b² Here a = 100, b= 2 (100 + 2)(100 – 2) = 100² – 2² =10000 – 4 102 × 98 = 9996

Answer»

102 × 98 = (100+ 2) (100 – 2)

Identity (a + b)(a – b) = a² – b²

Here a = 100, b= 2

(100 + 2)(100 – 2) = 100² – 2²

=10000 – 4

102 × 98 = 9996

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