# Math

Stacey buys a \$1000 RRSP today. After one year she adds \$2500. By the end of the second year, the money has grown to \$3851 as it has earned interest over time. What rate of interest does the money earn?

1000x^2 + 2500x - 3851

Use the quadratic formula above and your calculator to solve for x and i.

There are two solutions to the quadratic equation. Which one would you choose? Why?

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1. Choose the solution that makes sense. Most of the time only the positive solution makes sense.

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posted by Max
2. Simple example:

I drop a ball from 16 feet up. Its height can be modeled as h = -16t^2 + 16, where h = height in feet and t = time in seconds. When will the ball hit the ground?

16t^2 - 16 = 0
t = -1, 1

It took -1 second? No way.
It took 1 second? Yes!

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posted by Max

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