Question

10. Evaluate: (i) 69 x 71 (ii) 94 x106.
11. Evaluate: (i) 88 *92
(iil 78 x 82​

Answer 1

Step-by-step explanation:

1)= (70-1)(70+1)

= 70^2-1^2

=1400-1

=1399

2)= (100-6)(100+6)

=100^2 - 6^2

=10000-36

= 9964

3) =(90-2)(90+2)

= 90^2-2^

= 8100-4

= 8096

4) (80-2)(80+2)

= 80^2 - 2^2

= 6400-4

= 6396

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