To solve the equation x^2-8x=12 by completing the square, what number must be added to both sides of the equation.

5 years

Step-by-step explanation:

Hi, to answer this question we have to apply the simple interest formula:  

I = p x r x t  

Where:  

I = interest  

P = Principal Amount  

r = Interest Rate (decimal form)  

t = years

Replacing with the values given  

1400 = 7000x (4/100) x t

Solving for t:

1400 =7000 x 0.04 x t

1400 =280 t

1400/280 =t

t = 5 years

Feel free to ask for more if needed or if you did not understand something.