Question

if x-2/x=3 find the value of x^3-8/x^3​

Answer 1

Answer:

$x - 2 \div x = 3 \\ x - 2 = 3x \\ x - 3x = 2 \\ - 2x = 2 \\ x = 2 \div - 2 \\ x = - 1$

here we have solved the first equation which gives the value of the x

now taking the 2nd one and taking x= -1

${ - 1}^{3} - 8 \div { - 1}^{3} \\ - 1 - 8 \div - 1 \\ - 1 + 8 \\ = 7$