Question

Q10. if x -1/x =3; then find the value of x³ -1/x³   ​

Answer 1

Answer:

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Step-by-step explanation:

x => 3

then

x³ + 5x² - 11

==> 3³ + 5× 3² - 11

==> 27 + 5×9 - 11

==> 27+ 14- 11

==> 41-11

==> 30

so, your answer is 30

Answer 2

Step-by-step explanation:

Given:-

X-1/X=3; then find the value of x^3-1/x^3

Solution:-

Here is an trick to answer this type of questions:

Whenever you gets the same expression which have same variables and answer of the one is given and asks you to find the other; like the above equation asks them you can do just like me.

–→ x-1/x=3 (given)

We have to find cube of the 'x' variable

x^3-1/^3=9 (I simply multiplied with 3)

Some other examples like this:-

5x+9/10x=15 (question)

5x^2+9/10^2= 15×2 (again I multiplied with 2 because there is x^2)