2. Confirm that 1 + V5 and 1 - V5 are the correct roots for x^2 - 2x - 4 = 0.

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asked May 26, 2021 78.5k views

4 votes

2. Confirm that 1 + V5 and 1 - V5 are the correct roots for x^2 - 2x - 4 = 0.

Mathematics
middle-school

ColinD asked

by ColinD

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1 Answer

4 votes

Answer:

Explanation:

${\displaystyle \Delta =b^(2)-4ac} (for this equation b=-2 ; a=1 ; c=-4 )Δ= (-2)^2-4*(-4)*1=4+16=20√(20) =2√(5) x_(1)=(2+2√(5) )/(2) = (2(1+√(5)) )/(2) =1+\sqrt{5x_(2)=(2-2√(5) )/(2) = (2(1-√(5)) )/(2) =1-\sqrt{5$

Robert Almgren answered May 31, 2021

by Robert Almgren

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