Question

the number (3+✓2)(3-✓2)is:

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Answer 1

Answer:

(3 + ✓2)(3 - ✓2)....[because a² - b² = (a + b) (a - b)]

= (3)² - (✓2)²

= 9 - 2

= 7

Answer 2

Answer:

(a+b)(a-b)=a^2-b^2 here a=3 and b=root 2

SO 9-2=5 ANS IS 7