Solve the equation by completing the square.x2 + 4x = 7
A. 2 + 
B. -2 ± 
C. -1 ± 
D. -2 ± 2
Answer: B
Mathematics
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Solve the absolute value equation or inequality. Give the solution set in interval form.
- 7 < -4
A. 
B. ?
C. 
D. 
? 
Mathematics
Solve the system for x and y using Cramer's rule. Assume a and b are nonzero constants.x + by = a2x + ay = b2
A. {(a2 + ab + b2, -b - a)} B. {(a2 + 2ab + b2, -b - a)} C. {(a2 + ab + b2, a + b)} D. {(a2 + 2ab + b2, b - a)}
Mathematics
Factor the trinomial completely. If the polynomial cannot be factored, write "prime."3x3y5 + 3x2y5 - 18xy5
A. 3xy5(x - 2)(x + 3) B. y5(3x2 + 6x)(x - 3) C. 3xy5(x + 2)(x - 3) D. prime
Mathematics
Add.7x8 - 6x3 + 2x2 + 9 and 9x7 + 4x3 - 5x
A. 7x8 + 9x7+ 2x3 + 2x2 - 5x + 9 B. 16x8 - 10x3 + 2x2 - 5x + 9 C. 16x8- 2x3 + 2x2 - 5x + 9 D. 7x8 + 9x7- 2x3 + 2x2 - 5x + 9
Mathematics