Using suitable identities, evaluate the 72 x 68.

1.	Using suitable identities, evaluate the 72 x 68.
Answer» 72 x 68 = (70 + 2) (70 – 2) = (70)² – (2)² [Using in identity (a + b) (a – b) = a² – b²] = 4900 – 4 = 4896

Answer»

72 x 68

= (70 + 2) (70 – 2)

= (70)² – (2)² [Using in identity (a + b) (a – b) = a² – b²]

= 4900 – 4

= 4896

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