71. If (5x + 1)3 + (x - 3)3 + 8(3x - 4)3 = 6(5x + 1)(x - 3)(3x - 4), then x is equal to:
72. The value of $$\frac{1}{4} + \frac{{\left[ {{{\left( {20.35} \right)}^2} - {{\left( {8.35} \right)}^2}} \right] \times 0.0175}}{{{{\left( {1.05} \right)}^2} + \left( {1.05} \right)\left( {27.65} \right)}}{\text{is:}}$$
73. If a3 + b3 = 218 and a + b = 2, then the value of $$1 - \sqrt {ab} $$ is:
74. If [8(x + y)3 - 27(x - y)3] ÷ (5y - x) = Ax2 + Bxy + Cy2, then the value of (A + B + C) is:
75. If x3 - 4x2 + 19 = 6(x - 1) then what is the value of $$\left[ {{x^2} + \frac{1}{{x - 4}}} \right]?$$
76. If (5√5x3 - 3√3y3) ÷ (√5x - √3y) = (Ax2 + By2 + Cxy), then what is the value of (3A - B - $$\sqrt {15} $$ C)?
77. If $$x + \frac{1}{x} = 3\sqrt 2 ,$$ then what is the value of $${x^5} + \frac{1}{{{x^5}}}?$$
78. If x3 + 27y3 + 64z3 = 36xyz, then the relationship between x, y and z is:
79. If (x + y + z) = 0, then what is the value of $$\frac{{3{y^2} + {x^2} + {z^2}}}{{2{y^2} - xz}}?$$
80. If $$x + \frac{1}{x} = - 14,$$ and x < -1 what will be the value of $${x^2} - \frac{1}{{{x^2}}} = ?$$
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