1.

Evaluate these using identity :8.5 × 9.5

Answer»

8.5 × 9.5 = (9 – 0.5) (9 + 0.5) 

Here a = 9, b 

= 0.5 (9 – 0.5)(9 + 0.5) 

= (92) – (0.5)2 

= 81 – 0.25 

= 80.75



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