Question

If c = 13 and d = 15, then value of [(c - d)² + (c + d)²]/(c × d/3)
1. 455/65
2. 787/65
3. 788/65
4. 145/9

Answer 1

Correct Answer - Option 3 : 788/65

Given

c = 13 and d = 15

Calculation

[(c - d)² + (c + d)²]/(c × d/3)

⇒ [(13 - 15)² + (13 + 15)²]/(13 × 15/3)

⇒ [(-2)² + (28)²]/(13 × 5)

⇒ (4 + 784)/65

⇒ 788/65

∴ Value of [(c - d)2 + (c + d)2]/(c × d/3) is 788/65