Question : A complete factorisation of $(x^4+64)$ is:

Option 1: $(x^2+8)^2$

Option 2: $(x^2+8)$$(x^2-8)$

Option 3: $(x^2-4x+8)(x^2-4x-8)$

Option 4: $(x^2+4x+8)$$(x^2-4x+8)$

Question : Directions: If A denotes +, B denotes –, C denotes × and D denotes ÷, then which of the following equations is true?

Option 1: 8 B 6 D 2 A 4 C 3 = 15

Option 2: 8 A 8 B 8 C 8 = – 48

Option 3: 9 C 9 B 9 D 9 A 9 = 17

Option 4: 3 A 3 B 3 C 3 A 3 D 3 = 4

Question : A 9-digit number $846523X7Y$ is divisible by 9 and $Y - X = 6$. Find the value of $\sqrt{2X+4Y}$.

Option 1: 4

Option 2: 2

Option 3: 6

Option 4: 8