Expand: (3 + root 7)²-(3-root7)²
Answers
Answered by
1
Answer:
a^2-b^2=(a+b) (a-b)
so.
6(2√7) =12√7
Answered by
0
Answer:
(3+√7)²-(3-√7)²=12√7
Step-by-step explanation:
(3+√7)²-(3-√7)²
=(3+√7+3-√7)[3+√7-(3-√7)]
[using the identity a²-b²=(a+b)(a-b)]
=6(3+√7-3+√7)
=6×2√7
=12√7
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