Question
If 4x + y = 18 and xy = - 10, what is the value of 4x -
y?Solution
4x + y = 18 and xy = -10
(4x - y) 2 = (4x + y) 2 - 4(4x)(y)
(4x - y) 2 = (18) 2 - 16 (-10)
(4x - y) 2 = 22 2
4x - y = 22
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