Precalculus Examples

$\frac{4 x^{2} - 7 x}{x^{2} - 2 x - 35}$

Step 1

Factor $x$ out of $4 x^{2} - 7 x$ .

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Step 1.1

Factor $x$ out of $4 x^{2}$ .

$\frac{x (4 x) - 7 x}{x^{2} - 2 x - 35}$

Step 1.2

Factor $x$ out of $- 7 x$ .

$\frac{x (4 x) + x \cdot - 7}{x^{2} - 2 x - 35}$

Step 1.3

Factor $x$ out of $x (4 x) + x \cdot - 7$ .

$\frac{x (4 x - 7)}{x^{2} - 2 x - 35}$

Step 2

Factor $x^{2} - 2 x - 35$ using the AC method.

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Step 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 $- 35$ and whose sum is $- 2$ .

$- 7, 5$

Step 2.2

Write the factored form using these integers.

$\frac{x (4 x - 7)}{(x - 7) (x + 5)}$