三角学示例

$f (x) = x (x + 5)$

解题步骤 1

化简 $f (x)$ 。

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解题步骤 1.1

运用分配律。

$f (x) = x \cdot x + x \cdot 5$

解题步骤 1.2

化简表达式。

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解题步骤 1.2.1

将 $x$ 乘以 $x$ 。

$f (x) = x^{2} + x \cdot 5$

解题步骤 1.2.2

将 $5$ 移到 $x$ 的左侧。

$f (x) = x^{2} + 5 x$

解题步骤 2

The word linear is used for a straight line. A linear function is a function of a straight line, which means that the degree of a linear function must be $0$ or $1$ . In this case, The degree of $f (x) = x^{2} + 5 x$ is $2$ , which makes the function a nonlinear function.

$f (x) = x^{2} + 5 x$ is not a linear function

三角学 示例

三角学示例