What is the solution of rootindex 3 startroot x + 8 endroot = negative 4?
x = –72
x = –66
x = 58
no solution

First option.

Step-by-step explanation:

Given the following equation provided in the exercise:

You can follow the steps indicated below in order to find the solution of this equation:

1. Cubing both sides of the equation, you get:

2. Finally you must subtract 8 from both sides of the equation:

You can notice that this solution matches with the first option.

x = 10.1

step-by-step explanation:

all of the angles of a tirangle add up to 180º

180 - 65 = 115 (since we already know the value of one angle)

(2x + 7) + (8x + 7) = 115

(combins like terms) 10x + 14 = 115

(isolate the variable subtract 14 from both sides): 10x = 101

(find the variable divide both sides by 10): x = 101/10

x = 10.1

correct answers below: