write in expanded form 3 upon 2 X + 1 whole cube
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11
Answer:
3.375x^3 + 6.75x^2+ 4.5x +1
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{(3)/(2x+1)}^3 = 1 (say)
27/ (2x+1)^3 = 1
27 = (2x+1)^3
27 = 8x^3 + 1 + 6x(2x+1) {(a+b)^3 = a^3 + b^3 + 3ab(a+b) }
27 = 8x^3 + 1 + 12x^2 + 6x
26 = 8x^3 + 12x^2 + 6x
8x^3 + 12x^2 + 6x - 26 = 0
Required Equation⬆
27/ (2x+1)^3 = 1
27 = (2x+1)^3
27 = 8x^3 + 1 + 6x(2x+1) {(a+b)^3 = a^3 + b^3 + 3ab(a+b) }
27 = 8x^3 + 1 + 12x^2 + 6x
26 = 8x^3 + 12x^2 + 6x
8x^3 + 12x^2 + 6x - 26 = 0
Required Equation⬆
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