1. Which of the following conclusions is true about the statement below?
A. The statement is never true.
B. the statement is true when x =0.
C. The statement is true when x is negative.
D. The statement is always true.
My answer was B.
2. Solve for x in the equation x^2 - 2 x - 15 = 0 .
A. ( -3 , -5)
B. ( 3 , -5 )
C. (-3 , 5)
D. ( 3 , 5 )
My answer is C.
3. Select the approximate values of x that are solutions to f ( x ) = 0 , Where f ( x ) = 2 x^2 + 4 x + 9
A. ( -0.22 , 0.44 )
B. ( -2 , 4 )
C. ( -2.00 , -4.50)
D. ( -1.35 , 3.35 )
My answer is B.
4. f ( x ) = 3 x ^2 + 8 x + 3
A. ( 3.00, -0.33 )
B. ( -3 , 8 )
C. ( -2.67 , -1.00)
D. ( -1.00,2.67)
My answer is C.
5. f ( x ) = 8 x ^2 + 7 x + 4
A. ( - 0.39 , 1.27 )
B. ( -8 , 7 )
C. (-0.88 , -0.50 )
D. ( -2.00 , 1.75 )
My answer is B.
6.Select the values of x that are solutions to the inequality 0 > x ^2 + 5 x -2
A. x E ( -5-square root 33 / 2 , -5+square root 33 / 2)
B. x E ( -5- square root 33/ 2 , -5 + square root 33 / 2 )
C. x E ( - 00, -5- square root 33 )/2 U ( -5 + square root 33, 00 / 2 )
D. x E ( -00, -5- square root 33 ) /2 U ( -5 + square root 33 , 00 /2 )
My answer is A.
3 answers
#2 C is correct
#3 since the discriminant is negative, there are no real roots, so none of the choices is correct. Typo?
#4 I get -2.21, -0.45
That is, (-4±√7)/3
Typo?
#5 Again, no real roots. Typo?
#6 A and B look the same to me, but if A is
((-5-√3)/2 , (-5+√3)/2)
then (A) is correct.
I guess B is (-5) - (√3/2),...?
2 answers