Question

Please explain how to solve the question below​

Answer 1

(2d + d³) / (1 + d²)

Explanation:

1 / ((1/d) + d) + d

Multiply top and bottom of the fraction by d:

d / (1 + d²) + d

Use common denominator to add.

d / (1 + d²) + d (1 + d²) / (1 + d²)

(d + d (1 + d²)) / (1 + d²)

(d + d + d³) / (1 + d²)

(2d + d³) / (1 + d²)