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24 Aug 2024, 22:13
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B
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Difficulty:
5%
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Question Stats:
89% (00:32) correct
11%
(01:27)
wrong
based on 120
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(2√3 + √5) * (2√3 - √5) = ?
A. 1
B. 7
C. 4√15
D. 12 - 4√15
E. 17
A. 1
B. 7
C. 4√15
D. 12 - 4√15
E. 17
05 Sep 2024, 10:00
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(2√3 + √5) * (2√3 - √5) = ?
It's an expression of the form (a+b)*(a-b) which can be written as a^2-b^2
(2√3 + √5) * (2√3 - √5) = (2√3)^2 - (√5)^2 => 4*3 - 5 => 12 - 5 = 7 (B)
It's an expression of the form (a+b)*(a-b) which can be written as a^2-b^2
(2√3 + √5) * (2√3 - √5) = (2√3)^2 - (√5)^2 => 4*3 - 5 => 12 - 5 = 7 (B)
05 Sep 2024, 10:15
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(a+b)(a-b)= a^2-b^2
Using this property, answer is 7 (B)
Posted from my mobile device
Using this property, answer is 7 (B)
Posted from my mobile device
