Question

Given the functions f(x) and g(x) below, find all solutions to the equation

f(x) = g(x) to the nearest hundredth.

f(x) = 0.15x³ - 2x² +7x-3.3
g(x) = 1.5|x - 7.3

Answer 1

The solutions to the equation f(x) = g(x) to the nearest hundredth are x ≈ 1.76 and x ≈ 7.85.

Explanation:

f(x) = 0.15x³ - 2x² + 7x - 3.3

g(x) = 1.5|x - 7.3|

To solve the equation, we can set the two functions equal to each other and then solve for x:

0.15x³ - 2x² + 7x - 3.3 = 1.5|x - 7.3|

We can split this equation into two cases, depending on the sign of x - 7.3:

Case 1: x - 7.3 ≥ 0

In this case, we have:

0.15x³ - 2x² + 7x - 3.3 = 1.5(x - 7.3)

0.15x³ - 2x² + 7x - 3.3 = 1.5x - 10.95

0.15x³ - 2x² + 5.5x + 7.65 = 0

We can solve this cubic equation by using numerical methods, such as the Newton-Raphson method or the bisection method. One solution to this equation is x ≈ 1.76.

Case 2: x - 7.3 < 0

In this case, we have:

0.15x³ - 2x² + 7x - 3.3 = -1.5(x - 7.3)

0.15x³ - 2x² + 7x - 3.3 = -1.5x + 10.95

0.15x³ - 2x² + 8.5x - 14.25 = 0

Again, we can solve this cubic equation by using numerical methods. One solution to this equation is x ≈ 7.85. Therefore, the solutions to the equation f(x) = g(x) to the nearest hundredth are x ≈ 1.76 and x ≈ 7.85.

Answer 2

x = -4.05, x = 2.15, and x = 4.96.

Explanation:

To find the solutions to the equation f(x) = g(x), we need to substitute the expressions for f(x) and g(x) and solve for x.

0.15x³ - 2x² + 7x - 3.3 = 1.5x - 7.3

0.15x³ - 2x² + 5.5x + 3 = 0

We can solve this equation using numerical methods, such as graphing or using a calculator, to find the solutions to two decimal places. One possible method is to use a graphing calculator and graph the function y = 0.15x³ - 2x² + 5.5x + 3, and then use the intersect function to find the x-values where the function intersects the line y = 1.5x - 7.3.

Using this method, we find that there are three solutions to the equation, to the nearest hundredth: x = -4.05, x = 2.15, and x = 4.96.

Therefore, the solutions to the equation f(x) = g(x) to the nearest hundredth are x = -4.05, x = 2.15, and x = 4.96.