exam Maths Puzzle Numerical Ability

I was wondering if someone can show me how to set up the problem, im lost

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exam Other Question

Solve. 5(x - 2)^2 = 3

I do not understand how to complete this problem. Please help. Can someone help me?

A principal of $5,000 was invested in a savings account for 4 years. If the interest earned for the period was $400, what was the interest rate?

Thank you,
Ashley