Use Descartes' Rule of Signs to determine the possible number of positive real zeros and the possible number of negative real zeros for the function.f(x) = -7x4 - 2x3 - 8x2 - 4x + 6
A. 1 positive; 2 negative
B. 1 positive; 1 or 3 negative
C. 0 or 2 positive; 0 or 2 negative
D. 1 positive; 1 negative
Answer: B
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Determine what signs on values of x and y would make the statement true. Assume that x and y are not 0.
> 0
A. x and y must be positive. B. x and y have the same sign. C. x and y have different signs. D. x and y must be negative.
Fill in the blank with one of the words or phrases listed below. Not all choices will be used and some choices may be used more than once.
The expression a3 + b3 is called a 
.
A. sum of two cubes B. difference of two squares C. difference of two cubes D. perfect square trinomial
Subtract.(5x2 + 20x - 12) - (2x2 + 3x + 10)
A. 3x2 + 22x - 2 B. 3x2 + 17x + 22 C. 3x2 + 17x - 2 D. 3x2 + 17x - 22
Perform the operation using trigonometric form. Write the answer in the form a + bi
A. 
+ 
i
B. - 
+ 
i
C. 
+ 
i
D. - 
+ 
i