Question

X=4+root of 15 find the value of x^3-1÷x cube

Answer 1

Step-by-step explanation:

960×15^1/2- 1/960×15^1/2

x^3-1/x^3=x^3-1/x^3 identity

(x-1/x)(x2+1/x2+1)

(4×15^1/2 -1/4×15^1/2)(240+1/240+1)=

take product =

960×15^1/2-1/960×15^1/2