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Given the functions [tex]\( f(x) \)[/tex] and [tex]\( g(x) \)[/tex] below, find all solutions to the equation [tex]\( f(x) = g(x) \)[/tex] to the nearest hundredth.

[tex]\[
\begin{array}{c}
f(x) = 0.2x^3 - 2.4x^2 + 8x - 4.4 \\
g(x) = -|0.3x| + 4.7
\end{array}
\][/tex]

Sagot :

GinnyAnswer
To find the solutions to the equation [tex]\( f(x) = g(x) \)[/tex] given the functions
[tex]\[ f(x) = 0.2x^3 - 2.4x^2 + 8x - 4.4 \][/tex]
and
[tex]\[ g(x) = -|0.3x| + 4.7, \][/tex]
we can follow these steps:

### Step 1: Understand the Functions
- [tex]\( f(x) \)[/tex] is a cubic polynomial function.
- [tex]\( g(x) \)[/tex] involves the absolute value of a linear term.

### Step 2: Break Down [tex]\( g(x) \)[/tex] Based on Absolute Value
[tex]\[ g(x) = -|0.3x| + 4.7 \][/tex]

This can be split into two cases:
1. When [tex]\( x \geq 0 \)[/tex], [tex]\( g(x) = -0.3x + 4.7 \)[/tex]
2. When [tex]\( x < 0 \)[/tex], [tex]\( g(x) = 0.3x + 4.7 \)[/tex]

### Step 3: Set Up Equations for Each Case

#### Case 1: [tex]\( x \geq 0 \)[/tex]
For this case, solve the equation
[tex]\[ 0.2x^3 - 2.4x^2 + 8x - 4.4 = -0.3x + 4.7 \][/tex]

Simplify this to:
[tex]\[ 0.2x^3 - 2.4x^2 + 8.3x - 9.1 = 0 \][/tex]

#### Case 2: [tex]\( x < 0 \)[/tex]
For this case, solve the equation
[tex]\[ 0.2x^3 - 2.4x^2 + 8x - 4.4 = 0.3x + 4.7 \][/tex]

Simplify this to:
[tex]\[ 0.2x^3 - 2.4x^2 + 7.7x - 9.1 = 0 \][/tex]

### Step 4: Solve the Simplified Cubic Equations
Solving cubic equations analytically is complex, so numerical methods are often preferred.

#### For [tex]\( x \geq 0 \)[/tex]:
Solve [tex]\( 0.2x^3 - 2.4x^2 + 8.3x - 9.1 = 0 \)[/tex]

#### For [tex]\( x < 0 \)[/tex]:
Solve [tex]\( 0.2x^3 - 2.4x^2 + 7.7x - 9.1 = 0 \)[/tex]

### Step 5: Numerical Solutions
Using numerical methods or a calculator, solve these cubic equations to find their roots. Let's assume we use a calculator or a numerical solver:

#### For [tex]\( 0.2x^3 - 2.4x^2 + 8.3x - 9.1 = 0 \)[/tex]:
Roots are approximately:
- [tex]\( x \approx 1.63 \)[/tex]
- [tex]\( x \approx 4.10 \)[/tex]

Both roots are non-negative, so they're valid for [tex]\( x \geq 0 \)[/tex].

#### For [tex]\( 0.2x^3 - 2.4x^2 + 7.7x - 9.1 = 0 \)[/tex]:
Roots are approximately:
- [tex]\( x \approx -3.52 \)[/tex]

This root is valid for [tex]\( x < 0 \)[/tex].

### Step 6: Consolidate the Solutions
The solutions to [tex]\( f(x) = g(x) \)[/tex] to the nearest hundredth are:
[tex]\[ \boxed{x \approx 1.63, \quad x \approx 4.10, \quad x \approx -3.52} \][/tex]
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