SOLUTION: absolute value of y2-3y is equal to 4.

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Question 451121: absolute value of y2-3y is equal to 4.
Answer by Gogonati(855) About Me  (Show Source):
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Base on the absolute value deffinition the equation abs%28y%5E2-3y%29=4 is
equivalent to the equations: y%5E2-3y=4 and y%5E2-3y=-4. We solve these
two equations:1)y%5E2-3y-4=0=>%28y%2B1%29%28y-4%29=0, where y=-1 and y=4.
2) y%5E2-3y%2B4=0, which has not real solution because the discriminant is
negative number.
answer: The solution of original equation is the set; {-1, 4}.