Solve the equation by completing the square.x2 - 8x - 15 = 0
A. {4 - 
, 4 + 
}
B. {-4 - 
, -4 + 
}
C. {4 - 
, 4 + 
}
D. {8 - 
, 8 + 
}
Answer: A
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Perform the addition and simplify.
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A. ?
B. ?
C. ?
D. ?
E. ?
Write the linear system corresponding to the reduced augmented matrix.
A. x1 = -4, x2 = t + 6, x3 = t for any real number t B. No Solution C. x1 = 4, x2 = -t + 6, x3 = t for any real number t D. x1 = 4, x2 = t + 6, x3 = 0
Find the coordinates of the vertex and x-intercepts for the quadratic function.f(x) = -x2 - 2x + 3
A. vertex (-1, -4) x-intercepts (1, 0), (- 3, 0) B. vertex (1, -4) x-intercepts (-1, 0), (3, 0) C. vertex (1, 4) x-intercepts (-1, 0), (3, 0) D. vertex (-1, 4) x-intercepts (1, 0), (- 3, 0)
Find all cube roots of the complex number. Leave answers in trigonometric form.125i
A. 5 cis 30°, 5 cis 150°, 5 cis 270° B. 5 cis 60°, 5 cis 180°, 5 cis 300° C. 1, -1, -i D. 5 cis 0°, 5 cis 120°, 5 cis 240°