Factor by grouping to obtain the difference of two squares.x2 - 18x + 81 - x4
A. (x + 9 + x2)(x + 9 - x2)
B. (x - 9 + x2)(x + 9 - x2)
C. (x + 9 + x2)(x - 9 - x2)
D. (x - 9 + x2)(x - 9 - x2)
Answer: D
Mathematics
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Solve the equation.2(x + 7) + 77 = 9x - 7(x + 5)
A. no solution B. 112 C. 42 D. all real numbers
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Write a formula for the nth term of the arithmetic sequence. Do not use a recursion formula.0.25, 0.3, 0.35, 0.4, 0.45, . . .
A. an = 0.05n + 0.2 B. an = 0.1n + 0.4 C. an = 0.25 + 0.05n D. an = 0.1n + 0.2
Mathematics
Find the nth term of the geometric sequence.
, 
, 
, . . . ; n = 11
A. 
B. 
C. 
D. 
Mathematics
Find the domain of the function.f(x) = 
A. all real numbers, or (-?, ?) B. {x|x ? -7}, or (-?, -7) ? (-7, ?) C. {x|x < 7}, or (-?, 7) D. {x|x ? 0}, or (-?, 0) ? (0, ?)
Mathematics