Question

(i) (2√3+√5)(2√3-√5)​

Answer 1

Answer:

7

Step-by-step explanation:

(2√3+√5)(2√3-√5) = (2√3)^2-(√5)^2

(4*3)-(5)

12-5

=7

Answer 2

Answer:

In these type of question ...you can find that it is in the form :

      ( a+b)(a-b) = a² - b²

so 2√3 ⇒ a , √5 ⇒ b

hence:

(2√3+√5)(2√3-√5) = (2√3)² - (√5)²

(4*3) - (5) = 12-5

               = 7

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