Question

Simplify (4 +√5) (4 - √5 )​

Answer 1

11

Step-by-step explanation:

(4 + √5) (4 - √5)

=> (4)² - (√5)²

[by the formula (a+b)(a-b) = a² - b², here a = 4 & b = √5]

=> 4² - √5²

=> 16 - 5

=> 11

Hence the simplification is 11.

hope it helps.

Answer 2

Answer:

=(4 - √5)²

=( 4 )² + (√5)² - 2(4)(√5)

= 16+5-8√5

=21-8√5

Hope it will help you

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