Question

plzz help me with maths

Answer 1

2x + 1/3x = 4

Multiply 3/2 on both sides

3/2 (2x + 1/3x) = 3/2  x  4

3x + 1/2x  = 6   .................(1)

(3x + 1/2x)³  = 27x³ + 1/8x³ + 3*3x*1/2x(3x +1/2x)

6³   =    27x³ + 1/8x³ + (9/2)*6

216 - 27 = 27x³ + 1/8x³

27x³ + 1/8x³ = 189

Answer is b) 189