Given,

the question is wrong as it should be x (x – 3) = -1

Find X^3(x^3-18)

Solution:

x (x – 3) = -1

taking cube on both  sides ,

×^3(X-3)^3= (-1)^3

×^3(x^3-27-9x^2+27x)= -1

from question, x^2-3x=-1

x^2= -1+3x keeping the value of x^2

x^3(x^3-27-9(-1+3x) +27x =- 1

x^3(x^3-27+9) =-1(-27  and +27 gets cancelled)

therefore,X^3(x^3-18) = -1

Hence answer is -1

Find