Question: Divide the y-axis into intervals defined by the boundary points and determine the sign of f(y) on each inter evaluate f (y) for a test

Divide the y-axis into intervals defined by the boundary points and determine the sign of f(y) on each inter evaluate f (y) for a test value of y on each of the 5 intervals. Let's use y = -8, -4, 0, 3, 8. Interval 1 Interval 2 Interval 3 Interval 4 Interval 5 Evaluate: f (-8) = 945 f (-4) =-495 f(0) = 49 f (3) = -320 If (8 ) = 945 f (y) A B C D E Where f(y) = (y-1)(y+1)(y-7)(1+7) A f ( - 8 ) > Vo. B f ( - 4 ) VO. D f (3 ) Vo. Part: 3 / 4 Part 4 of 4 The solution set includes the boundary points because the inequality sign includes equality. Write the solution set in interval notation

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