Question

Question

25x^2+1/4x^2=20

125x^3+1/x^3=????

Urgent!​

Answer 1

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$(1) \: \: \: \: \: \: \: \: = 25 {x}^{2} + \frac{1}{4} {x}^{2} = 20$

$= \frac{100 {x}^{2} + {x}^{2} }{4} = 20$

$= 101 {x}^{2} = 80$

$= {x}^{2} = \frac{80}{101}$

$= x = √0.7920792079$

$= x = \sqrt{0.889988319}$

$(2) \: \: 125 {x}^{3} + \frac{1}{ {x}^{3} } = ?$

$\frac{= 125 {x}^{3} \times {x}^{2} + 1 }{ {x}^{2} }$

$= \frac{125 {x}^{6} + 1}{ {x}^{3} }$

Answer 2

Answer:

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