Question

Using identites, evaluate the following (198)² ​

Answer 1

Step-by-step explanation:

#By (a-b) ^2=(a) ^2 + (b) ^2 -2ab

#So

$$\begin{lgathered}(200 - 2) ^{2} = {200}^{2} + {2}^{2} - 2 \times 200 \\ \times 2 \\ \\ = 40000 + 4 - 800 \\ \\ = 40004 - 800 \\ \\ = 39204\end{lgathered}$$

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Answer 2

Answer:

39,204

Step-by-step explanation:

(200-2)^2

We have to use the identity

(a+b)^2 = a^2 + b^2 - 2ab

(200)^2 + (2)^2 - 2 (200)(2)

40000 + 4 - 800

40004 - 800

39,204

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