Question

4 Use (a - b)2 = a2- 2ab + b2 to evaluate the following:
(1) (99)^2
(ii) (997)^2
(iii) (9.8)^2​

Answer 1

Step-by-step explanation:

1.(99)²=(100-1)²

(100)²+1-2(1)(100)

10000+1-200

9801

2.(1000-3)²=(1000)²+9-2(3)(1000)

1000000+9-6000

994009

3.(10-0.2)²=

100+0.04-2(10)(0.2)

100+0.04-4

96.04

Answer 2

Answer:

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