Question

find the value 401squrae - 399 square

Answer 1

Answer:

(401+399)(401-301)=800*2=1600

Step-by-step explanation:

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Answer 2

Answer:

\begin{gathered}399 {}^{2} - 398 {}^{2} \\ (400 - 1) {}^{2} - (400 - 2) {}^{2} \\ 1600 -800 + 1 - 1600 + 1600 - 4 \\ 1600 + 1 - 800 - 4 \\ 800 - 3 \\ 797\end{gathered}

399

2

−398

2

(400−1)

2

−(400−2)

2

1600−800+1−1600+1600−4

1600+1−800−4

800−3

797

another method is (a^2-b^2) = (a+b)(a-b)