Question

examine, whether (3+√2) (3-√2) is a rational number or irrational number​

Answer 1

Answer:

• (3+root 2)(3-root 2)
• (3+root 2) is in the form of (a+b)(a-b)=a^2-b^2
• 3^2-( root2)^2
• 6- 2=4
• 4 is a rational number
• so the given number is also a rational number