Find all real numbers in the interval [0, 2?) that satisfy the equation.cos2 x + 2 cos x + 1 = 0
A. {2?}
B. {?}
C. 
D. 
Answer: B
Mathematics
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Solve the equation.x3 + 9x2 = 22x
A. {11, 0, -2} B. {-11, 0, 2} C. {11, -2} D. {-11, 2}
Mathematics
Find the range of the quadratic function.f(x) = x2 + 5
A. [-5, ?) B. [0, ?) C. [5, ?) D. (-?, 5]
Mathematics
Write the sentence as an equation. Let the variable x represent the number.The sum of twice a number and 7 is 17.
A. 2x - 7 = 17 B. 14x = 17 C. 2x + 7 = 17 D. x + 14 = 17
Mathematics
Find all solutions to the equation.cos x = - 
(Express your answer in radians, in exact form.)
A. 
B. 
C. 
D. 
Mathematics