Use the method of variation of parameters to solve the differential equation.D2y + 4Dy + 4y = 16
A. y = C1e2x + C2e2x + 4
B. y = C1e-2x + C2e-2x
C. y = C1e-2x + C2e-2x - 4
D. y = C1e-2x + C2e-2x + 4
Answer: D
Mathematics
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A. infinite number of solutions B. one solution C. no solution
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A. 40 B. -40 C. 1 D. -1
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A. No; no B. Yes; yes C. Yes; no D. No; yes
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