Factor the trinomial completely.x2 + 40x + 400
A. (x - 20)2
B. (x + 20)2
C. (x + 20)(x - 20)
D. prime
Answer: B
Mathematics
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Evaluate or simplify the given expression.sin (tan-1 x)
A. 
B. 
C. 
D. 
Mathematics
Answer the question.For f(x) = x2 - 9 and g(x) = 2x + 3, what is the domain of 
A. 
B. 
x ? - 
C. All real numbers
D. 
x ? - 
Mathematics
Simplify.
A. 1 B. -1 C. 0 D. not defined
Mathematics
Write the phrase as a variable expression. Use x to represent "a number."Five times the sum of a number and -25
A. 5[x + (-25)] B. 5+ x + (-25) C. 5x + (-25) D. 5x - (-25)
Mathematics