Solve by completing the square.x2 + 8x = 7
A. 4 + 
B. -4 ± 2
C. -1 ± 
D. -4 ± 
Answer: D
Mathematics
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State the domain and range of the function.f(x) = -8e-x + 1
A. Domain = (-?, ?); range = (-?, 1) B. Domain = (-?, ?); range = (-?, ?) C. Domain = (-?, ?) ? (-?, ?); range = (-?, 1) D. Domain = = (-?, ?); range = (-?, 1)
Mathematics
Use a half-angle formula to find the exact value of the expression.cos 112.5°
A. - 
B. 
C. - 
D. - 
Mathematics
Match f(x) with its graph.f(x) = -3x + 5
A. 
B. 
C. 
D. 
Mathematics
Write an equation for the piecewise function.
A. f(x) = 
B. f(x) = 
C. f(x) = 
D. f(x) = 
Mathematics