Question

the value of ( √7+√2) (√7-√2) is​

Answer 1

Answer:

$( \sqrt{7} + \sqrt{2} )( \sqrt{7} - \sqrt{2)}$

$7 - 2$

$= 5$

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Answer 2

Answer:

This can be solved by the identity of (a+b)(a-b)

Step-by-step explanation:

(root 7+root 2)(root 7- root 2)

applying (a+b)(a-b)=a2+b2-2ab

(root 7+root 2)(root 7-root 2)=(root 7)2+(root2)2 - 2X(root 7 X root 2)

(root 7)2+(root 2)2 -2 X root 7 X root 2

Since, square cancels the root and root and root gets cancelled=

7+2-7X2 = 7+2-14= 9-14= -5

I hope this will help u

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