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Layne
Mathematics
11 July, 03:19
What is a number mulitplyed by 8 and added by 6?
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Trent Powers
11 July, 03:36
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Xy = 8
x + y = 6
x + y = 6
x - x + y = - x + 6
y = - x + 6
xy = 8
x (-x + 6) = 8
x (-x) + x (6) = 8
-x² + 6x = 8
-x² + 6x - 8 = 0
-1 (x²) - 1 (-6x) - 1 (8) = 0
-1 (x² - 6x + 8) = 0
-1 - 1
x² - 6x + 8 = 0
x² - 4x - 2x + 8 = 0
x (x) - x (4) - 2 (x) + 2 (4) = 0
x (x - 4) - 2 (x - 4) = 0
(x - 2) (x - 4) = 0
x - 2 = 0 or x - 4 = 0
+ 2 + 2 + 4 + 4
x = 2 or x = 4
x + y = 6
2 + y = 6
- 2 - 2
y = 4
(x, y) = (2, 4)
or
x + y = 6
4 + y = 6
- 4 - 4
y = 2
(x, y) = (4, 2)
The two numbers that add up to 6 and multiply to 8 are 4 and 2.
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