Solve by completing the square to obtain exact solutions.x2 + 8x - 9 = 0
A. 1, -9
B. -1, 9
C. 0, -9
D. -3i, 3i
Answer: A
Mathematics
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Replace the Cartesian equation with an equivalent polar equation.xy = 1
A. 2r2 sin ? cos ? = 1 B. r2 sin 2? = 2 C. r sin 2? = 2 D. 2r sin ? cos ? = 1
Mathematics
Use the definition to find an expression for the instantaneous velocity of an object moving with rectilinear motion according to the given function relating s (in ft) and t (in s).s = 3t4 - 7t3 + 3
A. 12t3 - 21t2 + 3 B. 3t3 - 7t2 C. 12t3 - 21t2 D. 3t3 - 7t2 + 3
Mathematics
Write the following in interval notation.{x| -7 ? x < 7}
A. [-7, 7) B. (-7, 7) C. [-7, 7] D. (-7, 7]
Mathematics
Multiply and simplify. Assume that all variables represent positive real numbers.
? 
A. 
B. 
C. 30
D. 
Mathematics