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How do you find x if the arithmetic mean of x-8 and 2x plus 1 is x?
Wiki User
∙ 13y ago
The "arithmetic mean" is the 'average'. The average of 2 numbers is 1/2 of their sum.
The numbers are (x-8) and (2x+1). We're told that half of their sum is 'x'.
1/2 [ (x-8) + (2x+1) ] = x
Fine! We are not intimidated.
Multiply each side by 2 ==> (x-8) + (2x+1) = 2x
Eliminate parentheses ==> x-8 + 2x+1 = 2x
Group the like-terms on the left side ==> x + 2x - 8 + 1 = 2x
Combine like-terms ==> 3x -7 = 2x
Add 7 to each side ==> 3x = 2x + 7
Subtract 2x from each side ==> x = 7
Wiki User
∙ 13y ago
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What is the average arithmetic mean of 3x plus 1 and x-3?
1/2 (3x + 1 + x - 3) = 1/2 (4x - 2) = 2x - 1
How do you solve -2x plus 8 2?
As you've written it, it can't be solved. I'll assume you mean -2x plus 8=2. -2x=-6. x=3.
Fraction for 4x2 plus 10x plus 6?
I assume you mean factors for 4x2+10x+6.(2x+3)(2x+2).
Is -2x plus y8 in standard form?
If you mean -2x+y = 8 then y = 2x+8 as a straight line equation
What is 2x-1 plus 2x-1 plus 2x-1 plus 2x-1?
8x-4
What is 2X plus 3Y-X plus 5Y?
2x + 3y - x + 5y combine the like terms 2x - x + 3y +5y simple arithmetic x + 8y
What is the average arithmetic mean of 3x plus 1 and x-3?
1/2 (3x + 1 + x - 3) = 1/2 (4x - 2) = 2x - 1
Find the slope of the line of 2x plus 2y equals 7?
The slope of the line of 2x plus 2y equals 7 is (7/2x - 1).
-2x plus 4y -4 find the y?
The value of y in the equation -2x plus 4y -4, is 1 plus x/2.
How do you solve -2x plus 8 2?
As you've written it, it can't be solved. I'll assume you mean -2x plus 8=2. -2x=-6. x=3.
Fraction for 4x2 plus 10x plus 6?
I assume you mean factors for 4x2+10x+6.(2x+3)(2x+2).
Is -2x plus y8 in standard form?
If you mean -2x+y = 8 then y = 2x+8 as a straight line equation
What is 2x-1 plus 2x-1 plus 2x-1 plus 2x-1?
8x-4
Find the sum 3x2 plus 2x plus 3 plus x2 plus x plus 1?
3x2 + 2x + 3 + x2 + x + 1 = 4x 2+ 3x + 4
How do you find the slope of 2x plus 3x plus 6 equals 0?
-2
2x-3 3x plus 3?
If you mean: 2x-3 = 3x+3 then x = -6
In the equation 2x plus 28 what is the value of x?
If you mean 2x = 28 then the value of x is 14
