QUESTION 7 Find the value of k so that the given differential equation is exact. (y³ + kxy4—2x) dx + (3xy²+20x²y³) dy = 0. Then find the implicit solution. O 10; xy ³ + 5x²y4-x²=C ○ -10;x²y³+x²y4+x²=C -8; xy ³ - 5x²y + x = C; O 1 ; xy² − 3xy+x²=C

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