Tamil Nadu Board Class 9 Mathematics — Important Questions

If U = {1,2,3,4,5,6,7,8}, A = {2,4,6,8} and B = {1,2,3,4}, then (A ∪ B)' = ?

If A = {1,2,3,4,5} and B = {3,4,5,6,7}, then A − B = ?

Two sets A and B are such that n(A) = 12, n(B) = 9 and n(A ∪ B) = 18. How many elements are in A ∩ B?

The value of √8 in its simplest surd form is:

5√3 + 18√3 - 2√3 = ?

Which of the following numbers is irrational?

By the Remainder Theorem, what is the remainder when p(x) = x³ + 3x² + 3x + 1 is divided by (x + 1)?

If (x - 2) is a factor of p(x) = x² - 5x + k, what is the value of k?

Expand (3x + 4y)² using the identity (a + b)² = a² + 2ab + b².