Waloshin,
You are on the right track with Question 1 and
Malfoy answered it for you.
A shorter way would be:
2 + 2(1/x) = 3
Subtracting 2 from both sides gives you:
(2/x) = 1
Rewrite both sides as a fraction:
(2/x) = 1/1
Invert (flip) the fraction on both sides:
(x/2) = 1/1
Multiply both sides by 2:
x = 2
Question 2
My approach to solve
y = 2x^3 -3x^2-3x+2 is the following:
Step 1: Substitute the x value with whole numbers (integers) through trial and error to obtain a
y = 0 value.
Step 2: In this case there are 2 integer values
(x = 2) and
(x = -1)
Step 3: Rearrange to obtain
(x - 2)= 0 and
(x +1) = 0.
(These are two of your three factors)
Step 4: Expand these values to obtain a quadratic equation. In this case it is
(x^2 -x -2).
Step 5: Use trial and error to multiply the quadratic equation to obtain the original equation
y = 2x^3 -3x^2-3x+2
2x(x^2 -x -2) and
-1(x^2 -x -2).
Your third factor is the values outside of the brackets in the above line highlighted in bold.
Your answer would be
(2x-1) (x-2) (x+1)
Question 3:
Again,
Malfoy calculated this question correctly. Another way to look at it is shown below.
Let n= Number of marshmallows Garret ate
per minute.
Therefore n-1 = Number of marshmallows Cory ate
per minute
The below equation shows that Garret and Cory ate in the same timeframe
Garrett = Cory
60/n = 55/(n-1)
60(n-1) = 55n
60n-60 = 55n
5n-60 = 0
5n = 60
n = 12 marshmallows per minute.
Therefore Garrett ate 12 marshmallows per minute.
Cory ate n-1 marshmallows per minute (12 -1) = 11 per minute
Calculation check
Calculate the time both people ate their marshmallows.
It should be equal as stated in the question.
Garrett: 60/n = 60/12 =
5 minutes
Cory: 55/(n-1) = 55/(12-1) =
5 minutes
Both times are
equal
Conclusion:
Garrett ate
12 marshmallows per minute and
Cory ate
11 marshmallows per minute; both over a 5 minute period.
It is useful to do a calculation check as this can either validate your answer or allow you to troubleshoot your calculation to see if you've made a mistake. Handy especially during exams and it shows that you are more thorough in your work (It's like having a back up plan).
There is usually more than one way to solve mathematical problems as Malfoy and I have shown.
I am a slow typer

and was still replying to your post when Malfoy posted his reply which is why I answered all three questions

.
Dominic