Answer:
-3-i is the correct answer.
Step-by-step explanation:
Answer:
x = 1, -5.56
Step-by-step explanation:
x^2 = -7x - 8
shift -7x and -8 to the other side . Remember when u shift minus changes into plus.
x^2 + 7x + 8 = 0
using quadratic equation formula
in quadratic equation one value comes positive and other comes in negative
a = 1 , b = 7 and c = 8
taking positive sign
x = (-b + 
) /2*a
x = (-7 + 
) /2*1
x = (-7 + 
) /2
x = (-7 + 
)/ 2
x = -7 + 9 / 2
x = 2/2
x = 1
taking negative sign
(-b - ) /2*a
x = (-7 - ) /2*1
x = (-7 - 
) /2
x = -7 - 
/ 2
x = -7 - 4.12 / 2
x = -11.12/2
x = -5.56
therefore x = 1 , - 5.56
Answer:
The ocean surface is at 0 ft elevation. A diver is underwater at a depth of 138 ft. In this area, the ocean floor has a depth of 247 ft.
Step-by-step explanation:
There are forty cases of insomnia to be used in the study. There are two variables, the therapy and the improvement of sleep. There are two categorical variables in the study.
<h3>What is a variable?</h3>
The term variable refers to something whose value changes. An experiment would always have to variables; the independent variable and the dependent variable. The dependent variable changes when the independent variable is changed.
In this experiment, there are forty cases of insomnia to be used in the study. There are two variables, the therapy and the improvement of sleep. There are two categorical variables in the study.
Learn more about variable:brainly.com/question/17344045
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