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# When asked to solve A = P(1 + i) for i, one student answered = −1 P A i and another student answered P A P i − = . Are the two answers equiv

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Guest Mar 12, 2018

#1
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Solve for i:

A = P (i + 1)

A = (i + 1) P is equivalent to (i + 1) P = A:

P (i + 1) = A

Divide both sides by P:

i + 1 = A/P

Subtract 1 from both sides:

i = (A - P) / P     OR       i=A/P - P/P=A/P - 1. Yes, the two are equivalent!! The reason is very clear if you look at the last one.

Guest Mar 12, 2018
Sort:

#1
0

Solve for i:

A = P (i + 1)

A = (i + 1) P is equivalent to (i + 1) P = A:

P (i + 1) = A

Divide both sides by P:

i + 1 = A/P

Subtract 1 from both sides:

i = (A - P) / P     OR       i=A/P - P/P=A/P - 1. Yes, the two are equivalent!! The reason is very clear if you look at the last one.

Guest Mar 12, 2018

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