Compute the gradient of the function at the given point.
A. - 
i - 
j + 
k
B. 
i - 
j + 
k
C. 
i - 
j + 
k
D. - 
i - 
j + 
k
Answer: C
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Solve the equation by completing the square.x2 - 8x - 15 = 0
A. {8 - 
, 8 + 
}
B. {4 - 
, 4 + 
}
C. {4 - 
, 4 + 
}
D. {-4 - 
, -4 + 
}
Perform the indicated operations and simplify the result. Leave the answer in factored form.
A. 
B. 
C. 
D. (x + 9)(x - 7)
Match the correct function to the graph.
A. y = 1 - x2 B. y = -2x2 - 1 C. y = -2x2 D. y = -2x2 + 1
Write a system of linear equations in three variables, and then use matrices to solve the system.The table below shows the number of birds for three selected years after an endangered species protection program was started.
Use the quadratic function y = ax2 + bx + c to model the data. Solve the system of linear equations involving a, b, and c using matrices. Find the equation that models the data.
A. y = 3x2 + 10x + 29 B. y = 6x2 - 30x + 25 C. y = 4x2 + 20x + 24 D. y = 5x2 - 10x + 32