Question

if 2x - 1/2x=4 ,find, 4x2 +1/4x2 8x3-1/8x3​

Answer 1

2x – 1/2x = 4

Cubing on both sides

(2x – 1/2x)³ = 4³

8x³ – 1/8x³ –3×2x×1/2x×(2x–1/2x) = 64

8x³ – 1/8x³ –3×4 = 64

8x³–1/8x³ = 64+12

8x³ – 1/8x³ = 76