Question

(5) State, giving reason, whether the following numbers are rational or irrational
(a) 3+√7
(b)-2+√5
(c)(2+ √3)(2-√3)​

Answer 1

Answer:

Consider the problem

2

5

2

45

+3

20

=

2

5

2

3×3×5

+3

5×2×2

=

2

5

2×3

5

+3×2

5

=

2

5

6

5

+6

5

=

2

5

12

5

=6

Hence, 6, which is a rational number