# EM-Quiz1 - dy dx = 3 y is(a y = e 3 x(b y = Ce-3 x(c y = e...

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MATH 3321 EMCF Quiz 1 1/20/10 1. ln x x dx = (a) ln(ln x ) + C (b) 1 2 (ln x ) 2 (c) (ln x ) + C (d) 1 2 (ln x ) 2 + C (e) None of the above. 2. dx 4 + x 2 = 3. x cos 2 x dx = 4. x ln x dx = 1

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5. The order of the differential equation d 2 y dx 2 + 4 x dy dx + y cos x = d 3 ( e 2 x ) dx 3 is: (a) 1 (b) 2 (c) 3 (d) 4 (e) None of the above. 6. The order of the differential equation 2 u ∂x 2 + 3 u ∂x 2 ∂y + ∂u ∂y = xyu 4 is: 7. The set of all solutions of y - 6 x = 4 e 2 x is: 8. The set of all solutions of
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Unformatted text preview: dy dx = 3 y is: (a) y = e 3 x (b) y = Ce-3 x (c) y = e 3 x + C (d) y = Ce 3 x (e) None of the above. 2 9. The set of all solutions of y ±± = 12 x 2-4 cos 2 x + 6 is: (a) y = x 4-cos 2 x + 6 x + Cx (b) y = x 4 + sin 2 x + 3 x 2 + C (c) y = x 4 + cos 2 x + 3 x 2 + C 1 x + C 2 (d) y = x 4-sin 2 x + 6 x 2 + C 1 x 2 + C 2 x (e) None of the above. 10. The value(s) of λ such that y = e λx is a solution of y ±±-5 y ± + 6 y = 0 are: (a) λ = 5 (b) λ = 3 , λ = 2 (c) λ =-1 , λ = 5 (d) λ =-3 , λ =-2 (e) None of the above. 3...
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