Question

explain the last past please​

Answer 1

Answer:

hey bro here's your answer

Step-by-step explanation:

in the question the quick trick applied is known as to be rationalization of numbers.it is meant to multiplying the fractional number's denominator with the fraction with the both denominator number but signed down or sign changed.

now the explanation of your example question

=> x³+1/x³= 3³ (given)

now the next step towards the subtraction of the 3×3 from 3³

this step exists so because in left side the both x have the power of ³ so that two three's are rationalized to the other side of equal to sign. and become the number 3×3 so the next step

x-1/x=3³-3×3

x-1/x=27-9

x-1/x=18

hope now your problems are solved if not yet then I will solve this full problem also for you

x-1/x=18

x-1=18x

-1=17x

x has the value of-1/17