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Anonymous
y = x2 - 2x + 10
This is a minimum when dy/dx = 0
dy/dx = 2x - 2 :
When 2x - 2 = 0 then 2x = 2 : x = 1
Substituting in the equation gives y = 12 - (2 x 1) + 10 = 1 - 2 + 10 = 9.
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-4 plus 10 equals 6.
x=10
12 + 10 + 11 equals 33
A equals 4 because 4 plus 6 is 10 or 10 minus 6 is 4.
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