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mestny [16]
2 years ago
14

I don't understand how it gets the result

8b_{2}" align="absmiddle" class="latex-formula"> and b_{2}^{2} in the fourth equation.

Mathematics
1 answer:
Maksim231197 [3]2 years ago
7 0

Answer + Step-by-step explanation:

<u><em>your question is about equation 4</em></u> :

b_{1}=14-b_{2}

Then

\left( b_{1}\right)^{2}  =\left( 14-b_{2}\right)^{2}   \  \text{(this is a special product )}

Then

\left( b_{1}\right)^{2}  =14^{2}-2\times 14 \times b_{2}+ (b_2)^2

Then

\left( b_{1}\right)^{2}  =196-28 b_{2}+ (b_2)^2

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