Name: ID: B 24. Tell where the function is decreasing A) (0, o) C) always increa

Question

Name: ID: B 24. Tell where the function is decreasing A) (0, o) C) always increasing D) always constant E) always decreasing 25. Tell whether the functiony+7x is even or odd. If it is neither, so indicate. A) even B) odd C) neither 26. If 2 is a root ofx3+3x2 -4x -12 O, use synthetic division to factor the polynomial completely and list all real solutions of the equation. A) (x-3)(x-2)(x +2):x -3,2,-2 B) (x+3)(x-2)(x+2);x -3.2-2 C) (+3)(r-2): 3,2 D) (x +3)2(r-2): x -3,2 E) (x +3)(x-3)(x +2);x -3,3, -2 27. Evaluate the logarithm log,42 using the change of base formula. Round to 3 decimal places. A) 3.738 2 521 oop) : 1.420 1.921 D) 7.273 E) 1.623

Explanation / Answer

24. The graph goes down in the interval (-infinity,0). SO the function is decreasing in the interval (-infinity,0) .

25 . y = x5 + 7x3

at x=-x

y(-x)= (-x)5+7(-x)3 = -x5-7x3 = - (x5+ 7 x3) = y(x)

Since y(-x) = y(x) , so its an odd function.

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