Question

Plzzz tell the answer by Step by step and the answer was 7 ..In my book

Answer 1

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Answer 2

Answer:

answer is 7

Step-by-step explanation:

1. Here the principal is (a+b)(a-b)=a^2-b^2
2. here a=2√3;b=√5
3. substitute the values we get
4. (2√3+√5)(2√3-√5)
5. =(2√3)^2-(√5)^2
6. =(4×3)-5
7. =12-5
8. =7
9. hope you understand