Solve the equation by using the quadratic formula. 
Definitions:
Investment
The allocation of resources, usually monetary, into assets or projects expected to generate future profits or income.
Equilibrium Interest
The interest rate at which the demand for funds equals the supply of funds, balancing savings and investment in the economy.
Loanable Funds
Funds available for borrowing, influenced by savings and investments, which affect interest rates and economic activity.
Credit Rating
An assessment of the creditworthiness of a borrower in terms of their ability to repay a loan or debt.
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