The formula A = P + I shows that the total amount of money A received from an investment equals the principal P (the original amount of money invested) plus the interest I. Solve this formula for I.
just subtract P from both sides:
I = A-P
To solve the formula A = P + I for I (the interest earned), we need to isolate I on one side of the equation.
Start with the equation A = P + I.
To isolate I, we can subtract P from both sides of the equation:
A - P = P + I - P.
This simplifies to:
A - P = I.
Therefore, the solution to the equation is I = A - P.
To find the value of I, simply subtract the principal P from the total amount A received from the investment.