Basic Math Examples

$50 \cdot (\frac{1}{r} - \frac{1}{r \cdot {(1 + r)}^{9}}) + \frac{1000}{{(1 + r)}^{9}} = 1210$

Step 1

Simplify each term.

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Step 1.1

Apply the distributive property.

$50 \frac{1}{r} + 50 (- \frac{1}{r {(1 + r)}^{9}}) + \frac{1000}{{(1 + r)}^{9}} = 1210$

Step 1.2

Combine $50$ and $\frac{1}{r}$ .

$\frac{50}{r} + 50 (- \frac{1}{r {(1 + r)}^{9}}) + \frac{1000}{{(1 + r)}^{9}} = 1210$

Step 1.3

Multiply $50 (- \frac{1}{r {(1 + r)}^{9}})$ .

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Step 1.3.1

Multiply $- 1$ by $50$ .

$\frac{50}{r} - 50 \frac{1}{r {(1 + r)}^{9}} + \frac{1000}{{(1 + r)}^{9}} = 1210$

Step 1.3.2

Combine $- 50$ and $\frac{1}{r {(1 + r)}^{9}}$ .

$\frac{50}{r} + \frac{- 50}{r {(1 + r)}^{9}} + \frac{1000}{{(1 + r)}^{9}} = 1210$

Step 1.4

Move the negative in front of the fraction.

$\frac{50}{r} - \frac{50}{r {(1 + r)}^{9}} + \frac{1000}{{(1 + r)}^{9}} = 1210$

Step 2

Graph each side of the equation. The solution is the x-value of the point of intersection.

$r \approx 0.02380265$

Step 3