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CBSE Class 10 Answered

If  x=3+31/3+32/3   Find value of X3-9x2+8x+12
Asked by sunil | 11 Jul, 2018, 09:42: PM
answered-by-expert Expert Answer
x = 3 + 31/3 + 32/3 
x - 3 = 31/3 + 32/3 
Taking cube on both sides
(x - 3)3 = (31/3 + 32/3)3 
x3 - 3x2 (3) + 3x (32) - 27 = 3 + 9 + 3(31/3)(32/3) [31/3 + 32/3]
x3 - 9x2 + 27x - 27 = 12 + 9(x - 3)
x3 - 9x2 + 27x - 27 - 9x + 27 = 12
x3 - 9x2 + 18x - 12 = 0
Answered by Sneha shidid | 12 Jul, 2018, 09:39: AM

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