Question

If
2(x^2+1) = 5x find;

(i)x - 1/x
2)x^3-1/x^3​

Answer 1

answer is given below step by step:-

Step-by-step explanation:

2x^2+2=5x

2x^2-5x+2=0

2x^2-4x-x+2=0

2x(x-2)-1(x-2)=0

(x-2)(2x-1)=0

x-2=0 or 2x-1=0

x=2 or x=1/2

therefore

if x=2

x-1/x =2-1/2=3/2

if x=1/2

x-1/x =1/2-2

=-3/2