Solve this electric formula for the indicated variable.
Mathematics
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Solve by completing the square to obtain exact solutions.10x2 + 21x + 9 = 0
A. - 
, - 
B. 
, 
C. 
, 
D. - 
, - 
Mathematics
Use the given trigonometric function value of ? to find the requested trigonometric function value of the acute angle ?. Rationalize the denominators where necessary.cot ? = 
Find sin ?.
A. 
B. 
C. 
D. 
Mathematics
Multiply.-y(9x3 - 2y + 8x - 2y3)
A. -9x3 + 2x2y - 8y2 + 2y3 B. 9x3y - 2y2 + 8xy3 - 2y4 C. -9x3 + 2xy2 - 8xy3 + 2 D. -9x3y + 2y2 - 8xy + 2y4
Mathematics
Simplify.
A. 16 B. 32 C. 36 D. 6
Mathematics