MHB How to solve X for beta/portfolio investment

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To solve for A in the equation bP = 1.0 = 1.48A + (0.72 * (1-A)), the correct form is 1.0 = 1.48A + 0.72 - 0.72A. Expanding and combining terms results in 0.76A + 0.72 = 0. By isolating A, the equation simplifies to 0.76A = -0.72. Dividing both sides gives A approximately equal to -0.9473.
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bP = 1,0 = 1.48A + (0.72 * (1-A))

How does one solve for A in this given situation?
 
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Luclucluc said:
bP = 1,0 = 1.48A + (0.72 * (1-A))

How does one solve for A in this given situation?

What is your equation?
Is it:
\begin{cases}
bP = 1.0 \\
1.0 = 1.48A + (0.72 * (1-A))
\end{cases}
Or is it:
\begin{cases}
bP = 1, \\
0 = 1.48A + (0.72 * (1-A))
\end{cases}
 
Assuming that your equation is 1.48A+ (0.72(1- A))= 0, first expand the multiplication: 0.72(1- A)= 0.72- 0.72A.

That makes the equation 1.48A+ 0.72- 0.72A= 0.

Now, combine the two "A" terms: 1.48A- 0.72A= (1.48- 0.72)A= 0.76A.

That makes the equation 0.76A+ 0.72= 0.

Subtract 0.72 from both sides: 0.76A= -0.72.

Finally, divide both sides by 0.76: A= -\frac{0.72}{0.76}= 0.9473...
 
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