Pre-Algebra Examples

$\frac{3 d}{d^{2} + 2 d - 3} = \frac{5 d}{d^{2} + 2 d - 3} - \frac{2}{d^{2} + d - 2}$

Step 1

Factor $d^{2} + 2 d - 3$ using the AC method.

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Step 1.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $- 3$ and whose sum is $2$ .

$- 1, 3$

Step 1.2

Write the factored form using these integers.

$\frac{3 d}{(d - 1) (d + 3)} = \frac{5 d}{d^{2} + 2 d - 3} - \frac{2}{d^{2} + d - 2}$

Step 2

Simplify each term.

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Step 2.1

Factor $d^{2} + 2 d - 3$ using the AC method.

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Step 2.1.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $- 3$ and whose sum is $2$ .

$- 1, 3$

Step 2.1.2

Write the factored form using these integers.

$\frac{3 d}{(d - 1) (d + 3)} = \frac{5 d}{(d - 1) (d + 3)} - \frac{2}{d^{2} + d - 2}$

Step 2.2

Factor $d^{2} + d - 2$ using the AC method.

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Step 2.2.1

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $- 2$ and whose sum is $1$ .

$- 1, 2$

Step 2.2.2

Write the factored form using these integers.

$\frac{3 d}{(d - 1) (d + 3)} = \frac{5 d}{(d - 1) (d + 3)} - \frac{2}{(d - 1) (d + 2)}$

Step 3

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

$d \approx - 2.30277563, 1, 1.30277563$

Step 4