simplify (2+underroot7) (2-underroot7)
Answers
Answered by
0
Answer:
11
Step-by-step explanation:
(2+✓7)(2-✓7)
Using identity (a+b) (a-b)=a²-b²
2²-√7²
4+7 [square is always positive]
11
Answered by
0
Answer:
given:
(2+√7) *(2-√7)
=
wkt
(a+b) (a-b) = a^2 - b^2
= 2^2 - (√7) ^2
= 4 - 7
= -3
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